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Mozilla EUVDEUVD-2026-14863

| CVE-2026-4724 CRITICAL
Reliance on Undefined, Unspecified, or Implementation-Defined Behavior (CWE-758)
2026-03-24 mozilla GHSA-j97q-98f4-5wq3
Mozilla Information Disclosure Red Hat Suse
Critical
Disputed · 9.1 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14863
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.1

DescriptionCVE.org

Undefined behavior in the Audio/Video component. This vulnerability affects Firefox < 149.

AnalysisAI

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.

Technical ContextAI

The vulnerability resides in Mozilla Firefox's Audio/Video processing component, which handles multimedia codec operations, streaming protocols, and content rendering. Firefox's audio/video stack (built on WebRTC, FFmpeg, and proprietary codecs) processes untrusted media content from web sources. Undefined behavior in this context typically indicates memory safety issues such as out-of-bounds access, use-after-free, or uninitialized variable access in low-level codec or stream handling routines. The affected product is identified by CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, spanning all Firefox versions below 149. Without an assigned CWE identifier, the root cause class cannot be definitively confirmed, but undefined behavior in media processing commonly falls under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) or CWE-824 (Access of Uninitialized Pointer).

RemediationAI

Upgrade Firefox to version 149 or later immediately through the built-in update mechanism (Help > About Firefox on most platforms, which will auto-download and apply the patch) or by downloading the latest installer from mozilla.org. Firefox ESR users should upgrade to the corresponding patched ESR release. For enterprise environments, deployment via system management tools (SCCM, Puppet, Ansible) should be prioritized. Pending patches, users can reduce exposure by disabling auto-play of media content in Firefox preferences (privacy.autoplay.default = 5), using content blocking extensions to restrict third-party media scripts, and avoiding untrusted media sources. The official security advisory at https://www.mozilla.org/security/advisories/mfsa2026-20/ provides version-specific guidance; verify your current version at about:support.

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Vendor StatusVendor

Debian

firefox
Release Status Fixed Version Urgency
sid vulnerable 148.0.2-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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EUVD-2026-14863 vulnerability details – vuln.today
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