Back
CVE-2026-8389
JIT miscompilation in the JavaScript Engine: JIT component
High8.8EPSS 0.42%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| redhat-SADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.42% · top 63% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Weakness
- CWE-686 Function Call With Incorrect Argument Type (opens in a new tab)All about CWE-686 and its CVEs
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion') (opens in a new tab)All about CWE-843 and its CVEs
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer (opens in a new tab)All about CWE-119 and its CVEs
- CWE-733: Compiler Optimization Removal or Modification of Security-critical Code (opens in a new tab)All about CWE-733 and its CVEs
Affected products
References (6)
- https://bugzilla.mozilla.org/show_bug.cgi?id=2036983 (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-45/ (opens in a new tab)
- https://github.com/crixpwn/CVE-2026-8389 (opens in a new tab)exploit
- https://access.redhat.com/security/cve/CVE-2026-8389 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2476466 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8389.json (opens in a new tab)x_sadp-csaf-vex
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-8389)Record last updated .