CVE-2026-8090

Name: CVE-2026-8090
Creator: NVD / NIST
Published: 2026-05-07T13:16:13.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2026-8090 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

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

0.29%

20.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.35.2
Mozilla	Firefox	< 150.0.2
Mozilla	Firefox	>= 128.0, < 140.10.2
Mozilla	Thunderbird	< 140.10.2
Mozilla	Thunderbird	< 150.0.2

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2034352Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-40/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-41/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-42/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-43/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-44/Vendor Advisory

Timeline

Published: May 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-8090?

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

How severe is CVE-2026-8090?

CVE-2026-8090 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2026-8090?

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-2026-8090?

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

Scan your code now

Source: NVD / NIST