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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
Mozilla Buffer Overflow Red Hat
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

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
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
CRITICAL 9.1
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)

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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure victim to malicious page
Delivery
Serve crafted media stream
Exploit
GMP boundary check fails
Execution
Corrupt memory in media decoder
Impact
Leak or alter sensitive process memory
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim's Firefox to process attacker-controlled media through the Audio/Video GMP code path - in practice the victim must load a page or embedded media/ad delivering the malicious audio/video stream, and GMP-based media decoding must be active. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, 9.1) describes an unauthenticated, low-complexity, network-reachable flaw with high confidentiality and integrity impact but, notably, no availability impact - atypical for a buffer overflow, which usually crashes the process, so the A:N rating should be verified against Mozilla's advisory. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts, or injects via a malicious ad/iframe on a legitimate site, a web page that serves specially crafted audio or video designed to violate the GMP component's boundary checks. When a victim's Firefox loads and decodes the media, the incorrect boundary condition corrupts memory, which the attacker leverages to leak sensitive process memory or manipulate execution state. …
Remediation 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. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Firefox installations across the organization and issue a high-priority security alert to users and IT, marking Firefox as blocked for critical systems pending patch deployment. …

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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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