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Mozilla Firefox CVE-2026-16408

| EUVDEUVD-2026-46246 CRITICAL
Integer Overflow or Wraparound (CWE-190)
2026-07-21 mozilla GHSA-vjqx-x8rw-qjr9
Buffer Overflow Integer Overflow Red Hat Mozilla Suse
Critical
Disputed · 9.8 Vendor: mozilla
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Severity by source

Sources disagree (Low–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 attacker-supplied media over the network (AV:N) with low complexity and no privileges, but the victim must load the malicious media, so UI:R; memory corruption yields full C/I/A impact.

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
3.4 LOW
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 - 20:25 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: Playback component. This vulnerability was fixed in Firefox 153.

Articles & Coverage 1

News Critical Integer Overflow RCE in Mozilla Firefox Audio/Video - CVE-2026-16408 Jul 22, 2026

AnalysisAI

Memory-corruption via integer overflow in the Audio/Video Playback component of Mozilla Firefox lets a remote attacker who serves crafted media content trigger heap corruption that can lead to arbitrary code execution in the browser process. All Firefox versions prior to 153 are affected, and the NVD-assigned CVSS 3.1 base score of 9.8 (network vector, no privileges, no user interaction) reflects a full confidentiality/integrity/availability compromise. There is no public exploit identified at time of analysis and the issue is not listed in CISA KEV, so the score reflects potential rather than observed exploitation.

Technical ContextAI

The flaw lives in Firefox's Audio/Video Playback subsystem, which decodes and demuxes media streams (containers and codecs) that a web page can auto-load. CWE-190 (Integer Overflow or Wraparound) indicates an arithmetic computation - typically a size, length, or offset derived from attacker-controlled media metadata (e.g., sample counts, chunk sizes, or dimensions) - wraps past its integer bounds, causing an undersized allocation followed by an out-of-bounds write, which is why the vendor tags also list 'Buffer Overflow.' Because media parsing occurs automatically when content is rendered, the overflow is reachable directly from web content. The single affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, and Mozilla's advisory MFSA2026-68 tracks the fix; details are restricted in Bugzilla bug 2050477, consistent with Mozilla's practice of withholding specifics until users update.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, which is the fix confirmed in the description and MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/). Because Firefox auto-updates, ensure automatic updates are enabled and force an update check in managed fleets, then restart the browser to load the patched binaries. If immediate patching is not possible, reduce exposure by restricting untrusted browsing, and as a targeted compensating control disable media playback via the about:config preferences media.mediasource.enabled and media.autoplay.default (block autoplay) to limit automatic decoding of attacker-supplied media; the trade-off is broken audio/video playback on legitimate sites. Enterprise administrators can also enforce these settings through Firefox policies and consider deploying strict site allow-listing until the update is applied.

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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-2026-16408 vulnerability details – vuln.today
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