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Mozilla Firefox CVE-2026-8090

| EUVDEUVD-2026-28361 HIGH
Use After Free (CWE-416)
2026-05-07 mozilla GHSA-4345-ccpc-8955
Mozilla Information Disclosure Use After Free Memory Corruption
7.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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:N/S:U/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

4
Analysis Generated
May 07, 2026 - 15:45 vuln.today
CVSS changed
May 07, 2026 - 15:22 NVD
7.3 (None) 7.3 (HIGH)
CVE Published
May 07, 2026 - 12:45 nvd
UNKNOWN (no severity yet)
CVE Published
May 07, 2026 - 12:45 nvd
HIGH 7.3

DescriptionCVE.org

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, and Firefox ESR 115.35.2.

AnalysisAI

Use-after-free memory corruption in Firefox's DOM Networking component enables remote attackers to achieve unauthorized information disclosure, data manipulation, and service disruption without authentication or user interaction. Affects Firefox mainline and both Extended Support Release (ESR) branches. Mozilla shipped patches in Firefox 150.0.2, Firefox ESR 140.10.2, and Firefox ESR 115.35.2. SSVC analysis indicates no confirmed exploitation but the vulnerability is fully automatable with partial technical impact across confidentiality, integrity, and availability. EPSS data not available but the network attack vector (AV:N) with no prerequisites (AC:L/PR:N/UI:N) presents significant exposure for unpatched installations.

Technical ContextAI

Use-after-free (CWE-416) vulnerabilities occur when memory is accessed after being deallocated, causing unpredictable behavior including crashes, information leaks, or arbitrary code execution. This specific flaw resides in Firefox's DOM (Document Object Model) Networking component, which handles network operations within the browser's rendering engine. The CPE identifier cpe:2.3:a:mozilla:firefox confirms this affects the core Firefox application across multiple release channels. Use-after-free bugs in browser networking stacks are particularly dangerous because they process untrusted content from remote sources and operate within the security context of the browser process. The CVSS vector indicates exploitation requires only network access to a malicious resource without special configuration, authentication, or victim interaction beyond normal browsing activity.

RemediationAI

Immediately upgrade to Firefox 150.0.2 for mainline users, Firefox ESR 140.10.2 for organizations on the ESR 140 track, or Firefox ESR 115.35.2 for environments requiring long-term support releases. Download patches from https://www.mozilla.org/firefox/ or deploy via existing enterprise update mechanisms. Organizations unable to patch immediately should implement network-level content filtering to block access to known malicious domains delivering exploit payloads, though this provides incomplete protection given the automatable nature and lack of required user interaction. Browser sandboxing features in Firefox should remain enabled (default configuration) to limit scope of successful exploitation to the browser process. For high-security environments, consider temporary use of alternative browsers until patching is complete, though this introduces operational disruption and should be time-limited. No legitimate workaround exists to disable the DOM Networking component without breaking core browser functionality. Review Mozilla advisories at the URLs provided for additional vendor guidance and verification of patch integrity via digital signatures.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Server 12 SP5-LTSS Fixed
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed

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CVE-2026-8090 vulnerability details – vuln.today
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