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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
Mozilla Buffer Overflow Integer Overflow Suse Red Hat
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

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 - 20:25 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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Host page with crafted media file
Delivery
Victim's Firefox loads and decodes media
Exploit
Integer overflow undersizes allocation
Execution
Out-of-bounds write corrupts heap
Impact
Execute code in browser process
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim's Firefox (any version before 153) to decode attacker-controlled media through the Audio/Video Playback component - that is, the user must load a web page or media resource the attacker controls, which is the concrete precondition even though NVD marks UI:N. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are mixed: NVD rates this CVSS 9.8 with AV:N/AC:L/PR:N/UI:N, which treats it as a trivially remote, unauthenticated, no-interaction compromise, but the vulnerable component is media playback - realistically the victim must load a page or media resource controlled by the attacker, so genuine no-interaction exploitation is questionable and UI:R is arguably more accurate (verify against Mozilla's own rating). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a web page embedding a malicious audio or video file whose metadata triggers the integer overflow when Firefox decodes it. A victim running a pre-153 Firefox visits the page (or an ad/iframe serving the content), the undersized buffer is written out of bounds, and the attacker gains code execution in the browser process. …
Remediation 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/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all systems running Firefox versions prior to 153 and disable media playback in Firefox security settings or implement network-level restrictions blocking untrusted media sources; simultaneously issue a user communication alert to avoid clicking media links from unverified sources. …

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Same weakness CWE-190 – Integer Overflow or Wraparound

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9.8
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7.5
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CVE-2016-1010 HIGH
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CVE-2013-3940 CRITICAL
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Same technique Buffer Overflow

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CVE-2009-0927 HIGH POC
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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-2026-16408 vulnerability details – vuln.today
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