CVE-2026-109705

Published: Oct 13, 2026Modified: Oct 27, 2026Deferred

9.6

Vector

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

Exploitability: 2.8 / Impact: 6.0

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 (6)

https://bugzilla.mozilla.org/show_bug.cgi?id=2040905

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-106/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-108/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-109/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-110/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-119/

Source: security@mozilla.org

Timeline

No history available yet.