CVE-2026-8389

Name: CVE-2026-8389
Creator: NVD / NIST
Published: 2026-05-12T14:17:11.93+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2026-8389 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.31%

22.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 150.0.3

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2036983Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-45/Vendor Advisory
https://github.com/crixpwn/CVE-2026-8389

Timeline

Published: May 12, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-8389?

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

How severe is CVE-2026-8389?

CVE-2026-8389 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-8389?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-8389?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST