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Firefox Esr CVE-2026-4695

| EUVDEUVD-2026-14810 HIGH
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-03-24 mozilla GHSA-vxpv-c2h6-hq9v
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14810
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
HIGH 7.5

DescriptionNVD

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

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.

Technical ContextAI

The vulnerability resides in the Audio/Video Web Codecs component, a critical subsystem responsible for encoding and decoding multimedia streams in web browsers. Web Codecs handle raw audio and video frame data processing at the native code level, making boundary condition errors particularly dangerous as they can lead to out-of-bounds memory access. The affected products are Mozilla Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) and Mozilla Firefox ESR (cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*). The root cause appears to be improper validation of buffer boundaries during codec operations, which is a classic memory safety issue (CWE category for buffer over-read scenarios). This occurs in low-level codec implementations where strict boundary enforcement is essential to prevent memory disclosure.

RemediationAI

Immediately upgrade Firefox to version 149 or later, and Firefox ESR to version 140.9 or later. Both updates contain patches for the boundary condition vulnerability in the Web Codecs component. Users should enable automatic updates in Firefox preferences to ensure timely patching of future vulnerabilities. For enterprise environments unable to immediately patch, restrict user access to untrusted websites that use advanced audio/video streaming features (WebCodecs APIs) until upgrades are completed. Organizations managing Firefox ESR deployments should prioritize this update in their patch management cycle, as ESR releases often have longer deployment windows but still receive security patches on the same schedule as rapid-release Firefox.

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Vendor StatusVendor

Debian

firefox
Release Status Fixed Version Urgency
sid vulnerable 148.0.2-1 -
(unstable) fixed (unfixed) -
firefox-esr
Release Status Fixed Version Urgency
bullseye vulnerable 115.14.0esr-1~deb11u1 -
bullseye (security) vulnerable 140.8.0esr-1~deb11u1 -
bookworm vulnerable 128.14.0esr-1~deb12u1 -
bookworm (security) vulnerable 140.8.0esr-1~deb12u1 -
trixie (security), trixie vulnerable 140.8.0esr-1~deb13u1 -
forky, sid vulnerable 140.8.0esr-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: High
Product Status
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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CVE-2026-4695 vulnerability details – vuln.today

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