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CVE-2026-4724 Details

Undefined behavior in the Audio/Video component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CNA: CISA-ADPCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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URL	Source(s)	Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2014865	[email protected]	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-20/	[email protected]	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-23/	[email protected]	Vendor Advisory

CWE-ID	CWE Name	Source
CWE-758	Reliance on Undefined, Unspecified, or Implementation-Defined Behavior	CISA-ADP

Product	Versions
mozilla firefox	< 149.0
CPE cpe:2.3:a:mozilla:firefox:::::::: Remediation No remediation found in references.
mozilla thunderbird	< 149.0
CPE cpe:2.3:a:mozilla:thunderbird:::::::: Remediation No remediation found in references.

7 change records found show changes

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