CVE-2026-6766

high

Description

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

References

https://www.mozilla.org/security/advisories/mfsa2026-34/

https://www.mozilla.org/security/advisories/mfsa2026-33/

https://www.mozilla.org/security/advisories/mfsa2026-32/

https://www.mozilla.org/security/advisories/mfsa2026-30/

https://bugzilla.mozilla.org/show_bug.cgi?id=2023207

Details

Source: Mitre, NVD

Published: 2026-04-21

Updated: 2026-04-22

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

Severity: High

CVSS v3

Base Score: 7.5

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