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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
Buffer Overflow Integer Overflow Red Hat Mozilla Suse
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

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. There is no public exploit identified at time of analysis and the vulnerability is not listed in CISA KEV.

Technical ContextAI

The root cause is CWE-190 (Integer Overflow or Wraparound) within Firefox's Audio/Video subsystem, which decodes and processes media streams (containers, codecs, and audio/video sample buffers). An arithmetic operation on attacker-influenced values (such as sample counts, frame dimensions, or buffer sizes) wraps past the maximum integer bound, producing an undersized allocation or incorrect bounds check that leads to an out-of-bounds/heap buffer overflow - consistent with the 'Buffer Overflow' and 'Integer Overflow' tags supplied. The single affected product per CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, i.e. the Firefox browser itself; media parsing runs largely within the content process, making this component a recurring, high-value attack surface reachable purely through web content.

RemediationAI

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/). Because Firefox auto-updates, verify the update has actually applied in managed/enterprise fleets (check Help > About Firefox) and confirm any pinned or offline deployments are advanced to 153. If patching must be deferred, compensating controls include restricting untrusted web browsing and, where feasible, disabling or restricting media playback/autoplay to reduce exposure of the Audio/Video parsing path, and enabling stricter content controls; note these degrade the browsing experience and do not fully close the attack surface, so they are stopgaps only until 153 is deployed. The bug report at https://bugzilla.mozilla.org/show_bug.cgi?id=2047221 provides additional context.

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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-2023-21716 CRITICAL POC
9.8
CVE-2017-3599 HIGH POC
7.5
CVE-2017-7529 HIGH
7.5
CVE-2016-1010 HIGH
8.8

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-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

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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