CVE-2026-2758

CRITICAL

9.8

Description

Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/24/2026

Last Modified2/26/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mozilla:firefoxmozilla:thunderbird

Weaknesses (CWE)

CWE-416CWE-416

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2009608(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2026-13/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2026-14/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2026-15/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2026-16/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2026-17/(security@mozilla.org)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.