CVE-2026-8390

Name: CVE-2026-8390
Creator: NVD / NIST
Published: 2026-05-12T14:17:12.05+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2026-8390 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

Metrics

CVSS 3.1

7.3/10

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

EPSS Probability

0.23%

13.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 150.0.3

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2038081Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-45/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-8390?

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

How severe is CVE-2026-8390?

CVE-2026-8390 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2026-8390?

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-2026-8390?

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

Scan your code now

Source: NVD / NIST