CVE-2026-2781
nss - security update
9.8
CRITICAL
CVSS 3.1
EPSS 0.06%
Description
Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.
How to fix CVE-2026-2781
To remediate CVE-2026-2781, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 140.8.0esr-1~deb11u1 or later
- —upgrade to 2:3.61-1+deb11u5 or later
- —upgrade to 2:3.61-1+deb11u5 or later
- —upgrade to 2:3.87.1-1+deb12u2 or later
- —upgrade to 1:140.8.0esr-1~deb11u1 or later
Is CVE-2026-2781 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 140.8.0esr-1~deb11u1
- from 0, < 2:3.61-1+deb11u5
- from 0, < 2:3.61-1+deb11u5
- from 0, < 2:3.87.1-1+deb12u2
- from 0, < 1:140.8.0esr-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |