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Mozilla Firefox CVE-2026-16395

| EUVDEUVD-2026-46233 CRITICAL
Integer Overflow or Wraparound (CWE-190)
2026-07-21 mozilla GHSA-hrh9-m4mw-766h
Mozilla Buffer Overflow Integer Overflow Suse Red Hat
Critical
Disputed · 9.8 Vendor: mozilla
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Severity by source

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

Remote, unauthenticated, low-complexity media flaw, but a browser must render attacker content, so UI:R; memory corruption yields high C/I/A within the content process.

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

Lifecycle Timeline

4
Analysis Generated
Jul 21, 2026 - 20:22 vuln.today
CVSS changed
Jul 21, 2026 - 20:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:38 cve.org
CRITICAL 9.8

DescriptionCVE.org

Integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 153.

Articles & Coverage 1

News Critical Integer Overflow RCE in Mozilla Firefox Audio/Video - CVE-2026-16395 Jul 22, 2026

AnalysisAI

Memory-corruption via an integer overflow in Mozilla Firefox's Audio/Video component allows remote attackers to compromise the browser when a victim processes attacker-controlled media, with the CVSS 9.8 vector (AV:N/AC:L/PR:N/UI:N) indicating unauthenticated network exploitation and high impact to confidentiality, integrity, and availability. The flaw was fixed in Firefox 153 per Mozilla advisory MFSA2026-68. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure victim to malicious page
Delivery
Serve crafted audio/video file
Exploit
Integer overflow in media parser
Execution
Heap buffer overflow corrupts memory
Impact
Code execution in content process
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to use an unpatched Firefox (a version prior to 153) and to process attacker-controlled media through the Audio/Video component - typically by loading a web page or media resource that the attacker controls or has compromised. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8) rates this critical and fully remote/unauthenticated, though for a browser media flaw exploitation realistically requires the victim to load malicious content, a nuance the UI:N metric arguably understates. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a web page (or serves it via a malicious ad or compromised site) containing a specially crafted audio or video file whose header values trigger the integer overflow when Firefox's media pipeline allocates buffers. When a victim using an unpatched Firefox visits the page, the wrapped allocation causes a heap overflow that can corrupt memory and, given the C:H/I:H/A:H rating, potentially lead to code execution in the content process. …
Remediation Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, which contains the fix per Mozilla advisory MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit Firefox deployment across the enterprise and notify security and IT teams of the critical vulnerability and available patch (Firefox 153). …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Same weakness CWE-190 – Integer Overflow or Wraparound

View all
CVE-2013-2729 CRITICAL POC
9.8
CVE-2015-8651 HIGH
8.8
CVE-2012-5054 HIGH POC
8.8
CVE-2014-0569 CRITICAL POC
9.3
CVE-2017-3599 HIGH POC
7.5
CVE-2017-7529 HIGH
7.5
CVE-2016-1010 HIGH
8.8
CVE-2013-3940 CRITICAL
9.3

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2017-11882 HIGH POC
7.8
CVE-2010-3333 HIGH POC
7.8

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-2026-16395 vulnerability details – vuln.today
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