CVE-2025-11719
criticalStarting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption.
Vendor / product: Mozilla — firefox
Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption. This vulnerability was fixed in Firefox 144 and Thunderbird 144.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2025-10-14 13:15
Modified: 2026-10-18 21:10
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / firefox ≥143.0 <144.0
mozilla / thunderbird ≥143.0 <144.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2025-81/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2025-84/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1991950 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-81/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-84/ security@mozilla.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗