CVE-2026-109729
mediumUse-after-free in the JavaScript Engine: JIT component.
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
CVSS
5.4
5.4 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Severity source: NVD CVSS v3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
Timeline (UTC)
Published: 2026-10-13 13:17
Modified: 2026-10-13 19:18
NVD status: Deferred
Last synced 1 day ago
Verified against the source API 2026-10-27 06:59 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
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2074632 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-106/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-107/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-108/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-109/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-110/ security@mozilla.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:59 UTC · record ↗