CVE-2026-12318

HIGH 7.3CVE-2026-12318 · Published 16/06/2026 · updated 26/10/2026

In short

CVE-2026-12318 is a HIGH (CVSS 7.3) vulnerability affecting firefox (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.26%, higher than 18.2% of all vulnerabilities.
Fix: update to 152.0.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 152.0.0`	`152.0.0`
thunderbird mozilla	`< 152.0.0`	`152.0.0`

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

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Package

Affected versions

Patched versions

< 152.0.0

152.0.0

< 152.0.0

152.0.0

More vulnerabilities in firefox

See all →