CVE-2026-74944

Published: Aug 18, 2026Modified: Aug 21, 2026

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

Source: NVD

Description

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Affected (4)

Products: Mozilla: Firefox, Thunderbird

Mozilla

2 products

Firefox

Thunderbird

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 140.14.0
Mozilla Firefox	From 141.0.0 to 153.1.0
Mozilla Thunderbird	Before 140.14.0
Mozilla Thunderbird	From 141.0 to 153.1.0

Related CWEs

CWE-416

Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (7)

https://bugzilla.mozilla.org/show_bug.cgi?id=2057778

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-74/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-76/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-77/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-78/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-79/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-80/

Source: security@mozilla.org

Vendor Advisory

Timeline

No history available yet.