CVE-2026-109705

critical · 9.6

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, and Thunderbird 153.5.

9.6

CVSS

0.3%

EPSS (exploit prob.)

24th

EPSS percentile

2026-10-13

Published

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

Weaknesses

CWE-416

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2040905
https://www.mozilla.org/security/advisories/mfsa2026-106/
https://www.mozilla.org/security/advisories/mfsa2026-108/
https://www.mozilla.org/security/advisories/mfsa2026-109/
https://www.mozilla.org/security/advisories/mfsa2026-110/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-109705