CVE-2026-92021CWE-416

CVE-2026-92021

High · published September 15, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
19.7
In the wild
Unconfirmed
What it is

Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 140.16 and Thunderbird 140.16.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00282 · 19.7th percentile
Weakness
CWE-416 · Use After Free
Published
2026-09-15T17:16Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 140.16.0140.16.0
mozilla/thunderbird< 140.16.0140.16.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=2067208 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-92/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-95/ · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 12:33Z
    Use-after-free in the JavaScript Engine: JIT component
    cvelistv5