What’s Vulnerable › Vulnerabilities

CVE-2026-8389: JIT miscompilation in the JavaScript Engine: JIT component

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-119

Description

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

Affected products

• Mozilla Firefox: before 150.0.3 — fixed in 150.0.3

How to fix

Upgrade to a fixed version: Mozilla Firefox 150.0.3. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2036983
• https://www.mozilla.org/security/advisories/mfsa2026-45/
• 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

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