CVE-2026-100793CWE-843

CVE-2026-100793

Medium · published September 29, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
18.1
In the wild
Unconfirmed
What it is

JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00269 · 18.1th percentile
Weakness
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
Published
2026-09-29T17:17Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 157.0.0157.0.0
mozilla/thunderbird< 157.0157.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=2073268 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-101/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-97/ · [email protected]
EPSS history
Timeline
  • 01 OCT 03:44Z
    EPSS moved — → 0%
    epss
  • 29 SEP 12:36Z
    JIT miscompilation in the JavaScript Engine component
    cvelistv5