CVE-2026-6772
7.5
HIGH
CVSS 3.1
EPSS 0.05%
Description
Incorrect boundary conditions 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 to fix CVE-2026-6772
To remediate CVE-2026-6772, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 140.10.0esr-1~deb11u1 or later
- Debian/nss—no fix listed
- —upgrade to 1:140.10.0esr-1~deb11u1 or later
Is CVE-2026-6772 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 140.10.0esr-1~deb11u1
- from 0
- from 0, < 1:140.10.0esr-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |