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Vulnerability record · CVE-2026-12318 · published 16 June 2026

CVE-2026-12318: Mozilla firefox memory buffer overflow vulnerability

Mozilla · Firefox

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

7.3 CVSS 3.1 High EPSS 0.26% · top 83.7% CWE-119 · Memory buffer overflow
7.3CVSS 3.1 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=2023478 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-57/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-60/ Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-12318), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.