VulnerabilityModified
CVE-2026-8389
This vulnerability was fixed in Firefox 150.0.3.
HIGH 8.8EPSS 0.33%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-119, CWE-686, CWE-843, CWE-733
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2036983Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-45/Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-8389
- https://bugzilla.redhat.com/show_bug.cgi?id=2476466
- https://github.com/crixpwn/CVE-2026-8389
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8389.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.