Firefox

Multiple memory safety bugs affecting Firefox, Firefox ESR, and Thunderbird browsers present a critical remote code execution risk through memory corruption vulnerabilities. The affected versions include Firefox below 149, Firefox ESR below 115.34 and 140.9, Thunderbird ESR 140.8, Firefox 148, and Thunderbird 148. These memory safety issues demonstrate evidence of exploitable memory corruption that could allow attackers to execute arbitrary code on affected systems, though no public exploit or active KEV confirmation is currently documented.

Multiple memory safety bugs in Firefox 148 and Thunderbird 148 allow attackers to trigger memory corruption with potential for arbitrary code execution. Firefox versions prior to 149 are vulnerable, as confirmed by Mozilla security advisories. The vulnerability requires no user interaction beyond normal browsing and represents a critical elevation risk due to the presume-exploitable nature of the underlying memory corruption issues.

Multiple memory safety bugs affecting Firefox, Firefox ESR, Thunderbird, and Thunderbird ESR allow remote attackers to achieve arbitrary code execution through memory corruption vulnerabilities. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are confirmed affected, with evidence suggesting these memory corruption issues could be exploited under sufficient effort. The vulnerability class encompasses buffer overflow and memory safety defects that demonstrate exploitation potential, though no active public exploitation has been documented at this time.

A boundary condition vulnerability exists in Firefox's Graphics Text component that allows information disclosure through incorrect memory handling during text rendering operations. This affects Firefox versions below 149 and Firefox ESR versions below 140.9, potentially enabling attackers to read sensitive data from adjacent memory regions. No active exploitation in the wild has been confirmed, but the vulnerability warrants prompt patching given its information disclosure impact.

An undefined behavior vulnerability exists in the WebRTC Signaling component of Mozilla Firefox and Firefox ESR, potentially leading to information disclosure. This affects Firefox versions below 149 and Firefox ESR versions below 140.9. An attacker can exploit this through WebRTC signaling interactions to disclose sensitive information, though specific exploitation details remain limited in public disclosures.

A spoofing vulnerability exists in Firefox's Privacy: Anti-Tracking component that allows attackers to deceive users or bypass security mechanisms through fraudulent representation. Firefox versions prior to 149 are affected. While specific exploit details are limited in available intelligence, the spoofing nature suggests attackers could impersonate legitimate content or services, potentially leading to credential theft, phishing success, or privacy compromise. No CVSS score, EPSS data, or confirmed KEV status is currently available, limiting real-time risk quantification.

Mozilla NSS Libraries contain a denial-of-service vulnerability affecting Firefox versions below 149 that allows unauthenticated remote attackers to crash affected systems without requiring user interaction. The flaw stems from improper resource handling and currently lacks an available patch. Given the high CVSS score of 7.5 and network-based attack vector, this poses significant availability risk to Mozilla Firefox users.

Firefox versions below 149 are vulnerable to a resource exhaustion attack through malformed XML processing that an unauthenticated attacker can trigger remotely without user interaction. This denial-of-service vulnerability allows attackers to crash affected Firefox instances or degrade performance. No patch is currently available for this vulnerability.

Firefox's Netmonitor component contains a privilege escalation vulnerability that affects versions prior to 149 (ESR < 140.9), allowing unauthenticated attackers to gain elevated privileges through network-accessible attack vectors with no user interaction required. This critical flaw (CVSS 9.8) enables complete system compromise including confidentiality, integrity, and availability violations, with no patch currently available.

Mozilla Firefox versions below 149 and Firefox ESR below 140.9 contain memory safety flaws in the JavaScript Engine that enable remote code execution and denial of service attacks without user interaction or special privileges. An unauthenticated attacker can exploit improper boundary condition handling and uninitialized memory to achieve high-impact confidentiality violations and system availability disruption. No patch is currently available.

An uninitialized memory vulnerability exists in Firefox and Firefox ESR's Graphics Canvas2D component that can lead to information disclosure. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are affected. An attacker can exploit this by crafting malicious Canvas2D operations to read uninitialized memory contents from the graphics rendering pipeline, potentially exposing sensitive data from the browser process.

An incorrect boundary condition vulnerability exists in the Audio/Video component of Mozilla Firefox and Firefox ESR, allowing potential information disclosure through improper memory handling. Firefox versions below 149 and Firefox ESR versions below 140.9 are affected. An attacker may exploit this vulnerability to leak sensitive information from the browser process memory by triggering specific audio or video processing operations, though active exploitation status is not confirmed at this time.

An incorrect boundary condition vulnerability exists in the Graphics component of Mozilla Firefox and Firefox ESR, allowing information disclosure through improper memory access. Firefox versions below 149 and Firefox ESR versions below 140.9 are affected. An attacker can exploit this vulnerability to read sensitive information from memory by triggering the boundary condition in graphics processing operations.

An information disclosure vulnerability exists in the Widget: Cocoa component of Mozilla Firefox and Firefox ESR, allowing attackers to access sensitive information through the affected rendering engine. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are vulnerable. The vulnerability permits unauthorized information leakage, though the specific attack mechanism and data exposure scope require analysis of the referenced Mozilla security advisories.

Unauthenticated remote attackers can escape the Firefox sandbox through a use-after-free vulnerability in the Canvas2D graphics component, allowing arbitrary code execution on affected systems running Firefox versions prior to 149. The vulnerability requires no user interaction and impacts the entire system due to its critical severity and CVSS score of 10.0. No patch is currently available for this actively exploitable flaw.

A use-after-free vulnerability in Firefox's Cocoa widget component allows remote code execution without user interaction or special privileges, affecting Firefox versions below 149 and ESR below 140.9. An attacker can exploit this memory corruption flaw over the network to achieve complete system compromise with high confidentiality, integrity, and availability impact. No patch is currently available.

An incorrect boundary conditions vulnerability exists in Firefox and Firefox ESR's Audio/Video component that enables information disclosure attacks. Firefox versions below 149 and Firefox ESR versions below 140.9 are affected. Attackers can exploit improper boundary validation in audio/video processing to leak sensitive information from the browser process.

A boundary condition vulnerability exists in Firefox's Audio/Video GMP (Gecko Media Plugin) component that enables information disclosure to attackers. This flaw affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit incorrect boundary condition handling in media processing to disclose sensitive information from the affected browser process.

A boundary condition error in Firefox's Graphics component allows information disclosure through improper memory access validation. This vulnerability affects Firefox versions below 149 and Firefox ESR versions below 140.9, enabling attackers to read sensitive memory contents from the graphics processing context. While no CVSS score or EPSS data is currently available, the vulnerability is documented across multiple Mozilla security advisories indicating active awareness by the vendor.

A boundary condition vulnerability exists in Mozilla Firefox's Graphics Canvas2D component that enables information disclosure attacks. The vulnerability affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit incorrect boundary condition handling in Canvas2D operations to read sensitive data from memory, potentially disclosing user information or browser-internal data through a web-based attack vector.

This vulnerability involves incorrect boundary conditions in the Firefox Graphics Canvas2D component that can lead to information disclosure. The vulnerability affects Firefox versions prior to 149, Firefox ESR versions prior to 115.34, and Firefox ESR versions prior to 140.9. An attacker can exploit this flaw to access sensitive memory information through specially crafted Canvas2D operations, potentially exposing user data or system information.

An undefined behavior vulnerability exists in the WebRTC Signaling component of Mozilla Firefox and Firefox ESR, potentially enabling information disclosure attacks. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are affected. While specific exploitation mechanics are not fully detailed in available public sources, the vulnerability is classified as an information disclosure issue that could allow attackers to extract sensitive data through malformed WebRTC signaling messages.

Mozilla Firefox versions prior to 149 and Firefox ESR prior to 140.9 are vulnerable to denial-of-service attacks through the WebRTC signaling component, which an unauthenticated remote attacker can exploit without user interaction to crash affected browsers. The vulnerability stems from improper resource handling and currently has no available patch, leaving users of affected versions at risk of service disruption.

An undefined behavior vulnerability exists in the Firefox Audio/Video component that could lead to information disclosure. This affects all Firefox versions prior to 149. While specific exploitation details are limited due to missing CVSS and CWE data, the vulnerability's classification as information disclosure suggests an attacker could potentially access sensitive audio or video processing data or bypass security boundaries within the multimedia subsystem.

Firefox versions prior to 149 contain a use-after-free vulnerability in the JavaScript engine that allows unauthenticated remote attackers to achieve arbitrary code execution with no user interaction required. The vulnerability affects all Firefox users and can be exploited over the network to gain complete control over an affected system. No patch is currently available.

A JIT (Just-In-Time) compilation miscompilation vulnerability exists in Firefox's JavaScript Engine that can lead to information disclosure. This affects Firefox versions below 149 and Firefox ESR versions below 140.9. An attacker can exploit this vulnerability through malicious JavaScript code to potentially disclose sensitive information from the browser's memory or process space.

Firefox versions prior to 149 contain a privilege escalation vulnerability in the IPC component that allows remote attackers to escalate privileges through user interaction on affected systems. An attacker can exploit this flaw to gain elevated system access and potentially execute arbitrary code with higher privileges. No patch is currently available for this high-severity vulnerability affecting Mozilla and Debian users.

Mozilla Firefox versions below 149 (and ESR versions below 140.9) contain a use-after-free vulnerability in the JavaScript Engine that enables unauthenticated remote attackers to achieve arbitrary code execution without user interaction. The memory corruption flaw allows complete compromise of affected systems through network-based attacks. No patch is currently available for this critical vulnerability.

This vulnerability is a mitigation bypass in Firefox's HTTP networking component that allows attackers to circumvent existing security controls. Firefox versions below 149 and Firefox ESR versions below 140.9 are affected, enabling attackers to bypass authentication or other HTTP-level protections. While specific CVSS and EPSS scores are not provided, the mitigation bypass classification and Mozilla's issuance of security advisories indicate this requires prompt patching.

A boundary condition vulnerability exists in Firefox's Layout: Text and Fonts component that can lead to information disclosure. This affects Firefox versions below 149, Firefox ESR versions below 115.34, and Firefox ESR versions below 140.9. An attacker could exploit incorrect boundary handling in text and font rendering to potentially disclose sensitive information from memory, though specific exploitation details and active exploitation status are not publicly documented in the available intelligence.

A JIT miscompilation vulnerability exists in Firefox's JavaScript engine that can lead to information disclosure. This affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit this flaw through malicious JavaScript to extract sensitive information from the browser's memory, potentially compromising user data and system security.

A boundary condition vulnerability exists in Firefox and Firefox ESR's Audio/Video Web Codecs component that allows information disclosure. The vulnerability affects Firefox versions prior to 149 and Firefox ESR versions prior to 140.9. An attacker can exploit this flaw to disclose sensitive information, potentially leveraging web-based attack vectors without requiring elevated privileges.

Unauthenticated remote attackers can achieve arbitrary code execution through a use-after-free memory corruption vulnerability in Firefox's text and font rendering engine, affecting Firefox versions below 149, ESR below 115.34, and ESR below 140.9. The vulnerability requires no user interaction or special privileges and allows complete compromise of confidentiality, integrity, and availability. No patch is currently available.

A boundary condition vulnerability exists in Firefox's Audio/Video Web Codecs component that allows information disclosure to attackers. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are affected. An attacker can exploit incorrect boundary condition handling in codec processing to read sensitive memory contents or application state.

A boundary condition vulnerability combined with an integer overflow flaw exists in the Graphics component of Mozilla Firefox, affecting Firefox versions prior to 149, Firefox ESR versions prior to 115.34, and Firefox ESR versions prior to 140.9. This vulnerability could allow an attacker to trigger a buffer overflow through specially crafted graphics data, potentially leading to memory corruption and arbitrary code execution. While no CVSS score or EPSS data is currently available, the Mozilla security advisories confirm the vulnerability affects multiple product lines across different release channels.

An incorrect boundary condition vulnerability exists in the Audio/Video playback component of Mozilla Firefox, affecting Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. This flaw enables information disclosure through improper memory boundary handling during media playback operations. While specific exploit details and CVSS metrics are not publicly disclosed, the vulnerability is categorized as an information disclosure issue affecting all three Firefox release channels.

A sandbox escape vulnerability exists in Firefox's Responsive Design Mode component that allows attackers to break out of the browser's security sandbox and access sensitive information. This affects Firefox versions prior to 149, Firefox ESR prior to 115.34, and Firefox ESR prior to 140.9. An attacker can exploit this vulnerability to disclose information by circumventing the sandbox restrictions that normally isolate web content from the browser's privileged context.

Critical use-after-free in Mozilla Firefox's CSS parsing engine enables unauthenticated remote code execution with no user interaction required, affecting Firefox versions below 149, ESR 115.34, and ESR 140.9. An attacker can exploit this memory corruption vulnerability by crafting a malicious web page that triggers the vulnerability when rendered, achieving full system compromise. No patch is currently available.

A sandbox escape vulnerability exists in Mozilla Firefox due to incorrect boundary conditions and integer overflow within the XPCOM component, allowing attackers to break out of the browser's security sandbox and potentially execute arbitrary code with elevated privileges. Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9 are affected. An attacker capable of triggering the integer overflow in XPCOM can exploit the boundary condition flaw to escape the sandbox, potentially leading to full system compromise depending on browser privilege level and operating system context.

A sandbox escape vulnerability exists in Firefox's XPCOM component due to incorrect boundary conditions and integer overflow, allowing attackers to bypass security sandboxing mechanisms. This affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit this flaw to escape the browser sandbox and potentially execute arbitrary code with elevated privileges on the affected system.

Sandbox escape in Mozilla Firefox's Disability Access APIs component due to a use-after-free memory vulnerability allows unauthenticated remote attackers to execute arbitrary code with full system compromise. Firefox versions below 149 and Firefox ESR below 140.9 are affected, with no patch currently available. The vulnerability is exploitable over the network without user interaction, presenting critical risk to all affected users.

A sandbox escape vulnerability exists in Firefox's Telemetry component due to incorrect boundary condition handling, allowing attackers to potentially break out of the browser sandbox and access system resources or sensitive data. This affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. The vulnerability enables information disclosure and potentially arbitrary code execution by circumventing the sandbox isolation mechanism that normally restricts browser processes.

An incorrect boundary condition vulnerability exists in Firefox's Graphics Canvas2D component that can lead to information disclosure. This affects Firefox versions prior to 149, Firefox ESR versions prior to 115.34, and Firefox ESR versions prior to 140.9. An attacker can exploit this boundary condition issue to disclose sensitive information through crafted Canvas2D operations, though no active exploitation or public proof-of-concept has been reported at this time.

This vulnerability involves incorrect boundary conditions in Firefox's Graphics Canvas2D component that enables information disclosure. Firefox versions prior to 149, Firefox ESR prior to 115.34, and Firefox ESR prior to 140.9 are affected. An attacker can leverage improper boundary validation in Canvas2D operations to read sensitive information from memory that should not be accessible through normal web content restrictions.

Mozilla Firefox's WebRender graphics component contains a race condition and use-after-free vulnerability that enables remote code execution when a user visits a malicious webpage. The flaw affects Firefox versions prior to 149, Firefox ESR versions before 115.34 and 140.9, and requires user interaction to trigger. No patch is currently available for this high-severity issue.

AnythingLLM versions 1.11.1 and earlier contain an authentication bypass vulnerability on default installations where the application's HTTP endpoints and WebSocket connections lack proper authentication and accept requests from any origin. While rated CVSS 7.1, exploitation is limited to attackers on the same local network due to browser Private Network Access (PNA) protections, making this a medium-priority issue for most deployments.

Arbitrary code execution in Firefox versions prior to 148.0.2 results from multiple memory corruption flaws in the browser's memory safety implementation. An unauthenticated attacker can exploit these vulnerabilities through a malicious webpage requiring user interaction to achieve remote code execution with full system privileges. No patch is currently available for this vulnerability.

Firefox's CSS parsing engine fails to properly enforce same-origin policy restrictions, allowing attackers to perform unauthorized modifications to web content across different origins through user interaction. Versions prior to 148.0.2 are affected, and the vulnerability requires user engagement to exploit. No patch is currently available, leaving vulnerable installations at risk of data integrity attacks.

Firefox for Android versions prior to 148.0.2 contain a heap buffer overflow in the audio/video playback component that allows remote code execution, information disclosure, and denial of service through a malicious media file requiring user interaction. The vulnerability affects all Firefox for Android users and currently lacks a publicly available patch. An attacker can achieve complete system compromise by crafting a specially crafted video or audio file that triggers the buffer overflow when played.

Memory safety bugs in Firefox 147 and Thunderbird 147 with evidence of memory corruption. Mainline-only bugs not present in ESR branches.

Uninitialized memory read in Firefox Graphics Text component before 148. Text rendering may expose uninitialized memory contents.

Invalid pointer in Firefox DOM Core & HTML before 148. Incorrect pointer computation leads to memory access errors.

A use-after-free vulnerability in Firefox and Thunderbird's JavaScript WebAssembly engine allows remote attackers to achieve information disclosure or data manipulation through a malicious webpage or email attachment that requires user interaction. Affected versions include Firefox below 148 and Thunderbird below 148, with no patch currently available. The vulnerability has a network attack vector with low complexity and carries a CVSS score of 5.4.

The Settings UI component in Firefox and Thunderbird versions prior to 148 fails to properly restrict access to sensitive configuration data, enabling unauthenticated attackers to remotely disclose confidential information without user interaction. This vulnerability bypasses existing security mitigations designed to protect user settings and preferences. No patch is currently available for affected users.

Firefox and Thunderbird versions below 148 contain a race condition in the JavaScript garbage collection component that could allow an attacker to access or modify limited data through specially crafted content requiring user interaction. The vulnerability has a CVSS score of 4.2 and currently lacks an available patch.

Improper boundary condition handling in the JavaScript/WebAssembly engine of Firefox and Thunderbird before version 148 enables remote denial of service attacks without requiring user interaction or privileges. An attacker can crash affected applications or cause service unavailability by sending specially crafted content. No patch is currently available.

Spoofing in Firefox for Android WebAuthn component before 148. Allows phishing attacks through WebAuthn UI manipulation.

Use-after-free in Firefox DOM Core & HTML before 148. DOM object lifecycle error.

A use-after-free vulnerability in Firefox and Thunderbird's DOM processing allows remote attackers to execute arbitrary code through a malicious webpage or email attachment, requiring only user interaction to trigger. This affects Firefox versions below 148 and Thunderbird versions below 148, with no patch currently available.

Use-after-free in Firefox JavaScript GC before 148. Second GC UAF, different from CVE-2026-2795.

JIT miscompilation in Firefox WebAssembly before 148. The JIT compiler generates incorrect Wasm code, enabling type confusion. PoC available.

Use-after-free in Firefox JavaScript GC component before 148. GC-specific UAF affecting only mainline Firefox and Thunderbird.

Uninitialized memory in Firefox and Firefox Focus for Android versions prior to 148 enables remote attackers to read sensitive data without authentication or user interaction. The vulnerability allows information disclosure through memory that was not properly cleared before use, potentially exposing confidential user information to network-based attackers.

Memory safety bugs in Firefox ESR 115.32, ESR 140.7, and Firefox 147. Broader set of memory corruption issues than CVE-2026-2792.

Memory safety bugs in Firefox ESR 140.7 and Firefox 147 with evidence of memory corruption and potential code execution exploitability.

Cache-based mitigation bypass in Firefox Networking before 148. Caching mechanism can be exploited to bypass security mitigations.

Same-origin policy bypass in Firefox Networking JAR component before 148. Allows cross-origin data access through JAR protocol handling.

Use-after-free in Firefox ImageLib graphics component before 148. Image processing triggers use of freed memory.

Boundary error in Firefox Audio/Video GMP (Gecko Media Plugins) component before 148. Media plugin processing triggers memory corruption.

Use-after-free in Firefox DOM Window and Location component before 148. Window/Location lifecycle management error.

Use-after-free in Firefox JavaScript Engine before 148. Fourth distinct JS engine UAF in this release.

Invalid pointer in Firefox JavaScript Engine before 148. Incorrect pointer computation leads to memory corruption.

DOM Security mitigation bypass in Firefox before 148. Security mechanisms protecting DOM operations can be circumvented.

Unauthenticated attackers can extract sensitive information from Firefox and Thunderbird users through a JavaScript engine JIT compilation flaw, affecting all versions prior to Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8. The vulnerability requires no user interaction and can be exploited remotely over the network. No patch is currently available for this high-severity flaw.

Privilege escalation in Firefox Netmonitor component before 148. Second Netmonitor privilege escalation, separate from CVE-2026-2780.

Integer overflow in Firefox NSS (Network Security Services) Libraries component before 148. Overflow in the cryptographic library could affect TLS and certificate operations.

Privilege escalation in Firefox Netmonitor component before 148. Developer tools component allows escalation from content to higher privileges.

Boundary error in Firefox Networking JAR component before 148. Processing JAR (Java Archive) content triggers memory corruption.

Sandbox escape via DOM Core & HTML component in Firefox before 148. CVSS 10.0 — fifth sandbox escape in this release.

Privilege escalation in Firefox Messaging System component before 148. The inter-process messaging system allows escalation from content to privileged process.

Sandbox escape via Telemetry component in Firefox external software before 148. CVSS 10.0 — fourth sandbox escape in this release, through the telemetry subsystem.

HTML parser mitigation bypass in Firefox DOM before 148. Bypasses content sanitization protections via alternate authentication path in the HTML parser.

Integer overflow in Firefox Audio/Video component before 148. Overflow in media processing leads to incorrect memory allocations.

Boundary error in Firefox Web Audio component before 148. Crafted audio processing triggers memory corruption.

Use-after-free in Firefox Audio/Video Playback component before 148. Media playback triggers memory corruption.

Undefined behavior in Firefox DOM Core & HTML component before 148. Can lead to memory corruption and potential code execution.

Use-after-free in Firefox DOM Bindings (WebIDL) component before 148. Memory corruption in the interface between JavaScript and native DOM objects.

A use-after-free vulnerability in the IndexedDB storage component of Firefox and Thunderbird allows remote attackers to achieve arbitrary code execution through user interaction. Affected versions include Firefox below 148, Firefox ESR below 115.33 and 140.8, and Thunderbird below 148 and 140.8. No patch is currently available for this high-severity flaw.

Sandbox escape via IndexedDB in Firefox before 148 and Thunderbird. CVSS 10.0 — the Storage: IndexedDB component allows escaping the content process sandbox.

Use-after-free in Firefox JavaScript WebAssembly component before 148. WebAssembly-specific memory management bug.