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Mozilla Firefox EUVDEUVD-2026-46231

| CVE-2026-16359 CRITICAL
Buffer Overflow (CWE-119)
2026-07-21 mozilla GHSA-jwqr-9422-w9p4
Buffer Overflow Red Hat Mozilla
Critical
Disputed · 9.1 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
8.8 HIGH

Network-delivered crafted media, low complexity, no auth, but victim must load hostile content (UI:R); memory corruption plausibly yields high C/I plus crashes (A:H).

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
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 VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Jul 21, 2026 - 20:23 vuln.today
CVSS changed
Jul 21, 2026 - 20:22 NVD
9.1 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:38 cve.org
CRITICAL 9.1

DescriptionCVE.org

Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.

Articles & Coverage 1

News Critical Buffer Overflow in Mozilla Firefox GMP Component - CVE-2026-16359 Jul 21, 2026

AnalysisAI

Memory corruption in the Audio/Video Gecko Media Plugin (GMP) component of Mozilla Firefox lets remote attackers trigger a buffer overflow through crafted media content, which per CVSS can disclose sensitive process memory and corrupt process state (C:H/I:H). The flaw affects Firefox before 153 and the ESR 115.x and 140.x branches; Mozilla shipped fixes in Firefox 153, ESR 115.38, and ESR 140.13. There is no public exploit identified at time of analysis and it is not in CISA KEV, but the 9.1 CVSS reflects an unauthenticated, network-reachable memory-safety bug in a core browser subsystem.

Technical ContextAI

The Gecko Media Plugin (GMP) framework is Firefox's sandboxed host for audio/video decoding and DRM/EME plugins, processing untrusted media streams delivered by web pages. CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) here manifests as 'incorrect boundary conditions', meaning the decode/parse logic miscalculates buffer limits and reads or writes outside allocated memory when handling malformed media. Because GMP consumes attacker-supplied codec/container data, any inaccuracy in length validation can corrupt heap or stack memory. The only CPE provided is cpe:2.3:a:mozilla:firefox:*, so the identified affected surface is the Firefox application family (release and ESR), consistent with the three advisories mfsa2026-68/69/70 covering the parallel release and ESR trains.

RemediationAI

Vendor-released patches are available: upgrade to Firefox 153, Firefox ESR 115.38, or Firefox ESR 140.13 depending on the deployed channel - this is the primary and complete fix. ESR-channel deployments should move to 140.13 (or 115.38 for the older ESR line being retired) to remain on a supported branch. See the Mozilla Security Advisories at https://www.mozilla.org/security/advisories/mfsa2026-68/, mfsa2026-69/, and mfsa2026-70/ for per-channel detail. If immediate patching is not possible, a compensating control is to reduce use of the GMP media path - for example disabling DRM/EME playback (media.eme.enabled) and GMP-backed encrypted media via about:config or enterprise policy - which shrinks exposure of the vulnerable decode path at the cost of breaking DRM-protected streaming (e.g., some paid video services); pairing this with web content/ad filtering to limit untrusted media sources further narrows the attack surface until the update is deployed.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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EUVD-2026-46231 vulnerability details – vuln.today
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