Vulnerability record/PUBLISHED/Published Oct 27, 2026 14:05:18 UTC

CVE-2026-117903

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Base score6.3/ 10

SeverityMediumCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityMedium

Attack vectorNetworkAV

Attack complexityLowAC

Privileges requiredNonePR

User interactionRequiredUI

ScopeUnchangedS

Confidentiality impactLowC

Integrity impactLowI

Availability impactLowA

CVSS vector stringCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering Authoritymozilla

Last updatedNov 4, 2026 19:44:58 UTC

PublishedOct 27, 2026 14:05:18 UTC

ReservedOct 27, 2026 14:05:18 UTC

Credits

Mozilla