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Mozilla Firefox EUVDEUVD-2026-60675

| CVE-2026-74937 HIGH
Use After Free (CWE-416)
2026-08-18 mozilla GHSA-crpm-pxr9-5jcf
Use After Free Information Disclosure Mozilla Memory Corruption Red Hat Suse
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Network-delivered via webpage (AV:N), low complexity heap UAF (AC:L), no privileges or auth needed (PR:N), passive user visit required (UI:R), impact contained to browser process (S:U), full C/I/A within process.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Aug 18, 2026 - 20:28 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 8.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

AnalysisAI

Use-after-free in Mozilla Firefox's JavaScript garbage collector (GC) component enables remote code execution when a victim visits a malicious webpage. All Firefox versions prior to 154 and Firefox ESR versions prior to 153.1 are affected across multiple product lines, as indicated by four separate Mozilla Security Advisories (MFSA2026-74, -77, -78, -80). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts malicious page with crafted JavaScript
Delivery
Victim clicks phishing link or visits compromised site in unpatched Firefox
Exploit
JavaScript manipulates heap layout and triggers GC cycle
Execution
GC frees live object, leaving dangling pointer (UAF)
Persist
Dereferenced freed memory corrupts heap
Impact
Arbitrary code execution within Firefox renderer process
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Vulnerability AssessmentAI

Exploitation Exploitation requires passive user interaction (UI:R): a victim must open a malicious or attacker-influenced webpage in an unpatched version of Firefox (prior to 154 / ESR 153.1). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H yields a score of 8.8 and accurately characterizes a browser-based UAF: network-reachable, low exploitation complexity, no privileges required, but dependent on a user visiting an attacker-controlled page (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker registers a domain and hosts a webpage containing crafted JavaScript that manipulates the Firefox heap before triggering a GC cycle, causing the GC to free a live object and leaving a dangling pointer. When an unpatched Firefox user visits the page - via a phishing link, malvertising, or a compromised site - the dereferenced freed memory region is used to overwrite function pointers or control-flow data, achieving code execution within the Firefox renderer process. …
Remediation Upgrade Mozilla Firefox to version 154 or later, and Firefox ESR to version 153.1 or later - these are the vendor-confirmed fixed releases per Mozilla's advisories (https://www.mozilla.org/security/advisories/mfsa2026-74/ and https://www.mozilla.org/security/advisories/mfsa2026-77/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Issue a security alert advising users to avoid suspicious websites and defer non-critical browsing to alternative browsers; implement monitoring for exploitation attempts targeting the JavaScript garbage collector component. …

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Same technique Use After Free

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8.1

Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/firefox-esr:140.14-75.12 Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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EUVD-2026-60675 vulnerability details – vuln.today
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