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Mozilla Firefox CVE-2026-16364

| EUVDEUVD-2026-46195 CRITICAL
Buffer Overflow (CWE-119)
2026-07-21 mozilla GHSA-vf2m-xqpg-vqcc
Buffer Overflow Red Hat Mozilla
9.1
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Remote, unauthenticated, low-complexity via web content, but victim must load malicious media (UI:R); memory corruption yields code-exec potential and crashes, so C/I/A all High.

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
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

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 22, 2026 - 17:11 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
9.1 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
CRITICAL 9.1

DescriptionCVE.org

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Memory-corruption in Mozilla Firefox's Audio/Video Playback component allows a remote attacker to achieve confidentiality and integrity compromise (potentially arbitrary code execution) by delivering crafted media content to a victim's browser. Rooted in incorrect boundary conditions (buffer overflow, CWE-119), the flaw affects Firefox versions prior to 153 and carries a CVSS 9.1 rating, though EPSS exploitation probability is low (0.14%, 4th percentile) and no public exploit identified at time of analysis.

Technical ContextAI

The vulnerability lies in Firefox's media pipeline responsible for decoding and rendering audio/video content, exposed to any web page a user visits. The CWE-119 classification (Improper Restriction of Operations within the Bounds of a Memory Buffer) indicates that the playback code fails to correctly validate boundary conditions when processing media data, permitting reads or writes outside allocated buffer bounds - a classic memory-corruption primitive. The affected code path is reachable through the standard web content-loading mechanism, meaning malformed audio or video streams embedded in ordinary web pages can trigger the flaw. The single affected CPE, cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, confirms the desktop Firefox browser as the impacted product; Mozilla's own security advisory (MFSA2026-68) and the referenced Bugzilla entry (bug 2047802) are the authoritative sources.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all desktop Firefox installations to version 153 or later, which Mozilla states fixes this issue (MFSA2026-68, https://www.mozilla.org/security/advisories/mfsa2026-68/). Firefox's built-in auto-update mechanism will deliver the fix; enterprises managing Firefox via policy should push 153 through their update infrastructure and verify the deployed build number. Because the flaw is triggered by media content, an interim compensating control is to restrict or disable automatic media playback and untrusted media rendering (e.g., via enterprise policy or content-blocking extensions) until patching completes - with the trade-off that this degrades legitimate audio/video functionality. If an ESR branch is in use, confirm the corresponding fixed ESR release with Mozilla before assuming coverage.

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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 Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-16364 vulnerability details – vuln.today
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