CVE-2026-8091

Name: CVE-2026-8091
Creator: NVD / NIST
Published: 2026-05-07T13:16:14.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.48%

Last modified Jun 17, 2026

CVE-2026-8091 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.. EPSS estimates a 0.48% chance of exploitation in the next 30 days.

Description

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.48%

37.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-754

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.35.2
Mozilla	Firefox	>= 140.0, < 140.10.1
Mozilla	Thunderbird	>= 140.0, < 140.10.1

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2029301Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-30/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-36/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-39/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-42/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-8091?

How severe is CVE-2026-8091?

CVE-2026-8091 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.

How do I fix CVE-2026-8091?

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-2026-8091?

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

Scan your code now

Source: NVD / NIST