CVE-2026-8389

high

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

References

https://www.mozilla.org/security/advisories/mfsa2026-45/

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8389.json

https://github.com/crixpwn/CVE-2026-8389

https://bugzilla.redhat.com/show_bug.cgi?id=2476466

https://bugzilla.mozilla.org/show_bug.cgi?id=2036983

https://access.redhat.com/security/cve/CVE-2026-8389

Details

Source: Mitre, NVD

Published: 2026-05-12

Updated: 2026-07-15

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 7.5

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

Severity: High

EPSS

EPSS: 0.00018