CVE-2026-6767

Name: CVE-2026-6767
Creator: NVD / NIST
Published: 2026-04-21T13:16:22.577+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2026-6767 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.23%

13.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.35.0
Mozilla	Firefox	< 150.0
Mozilla	Firefox	>= 140.0, < 140.10.0
Mozilla	Thunderbird	>= 140.0, < 140.10.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2023209Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-30/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-31/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-32/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-34/Vendor Advisory

Timeline

Published: Apr 21, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-6767?

Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

How severe is CVE-2026-6767?

CVE-2026-6767 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2026-6767?

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-2026-6767?

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

Scan your code now

Source: NVD / NIST