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CVE-2026-8968

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component

HIGH
7.5
CVSS Score
Published: May 19, 2026 at 12:30 PM UTC
Updated: July 23, 2026 at 09:11 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 140.11.0v < 151.0.0
Vendor states this is fixed in 140.11 (unaffected)
Affected range stops below 140.11.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 151 (unaffected)
Affected range stops below 151.0.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 140.11v < 151.0.0
Vendor states this is fixed in 140.11 (unaffected)
Vendor states this is fixed in 151 (unaffected)
Affected range stops below 151.0.0, so it looks safe — our inference, not a vendor statement

References (5)

Permissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2030467
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-46/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-48/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-50/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-51/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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