A critical memory handling flaw in NSS during GHASH operations (CVE-2026-2781, CVSS 9.8) allows remote attackers to cause a denial of service or execute arbitrary code via specially crafted network traffic. The vulnerability affects Mozilla Firefox versions prior to 140.8.0 and 148.0, as well as Thunderbird versions prior to 140.8.0 and 148.0. Affected Ubuntu systems should apply the standard update to the patched `libnss3` package versions specified in the USN.
Ubuntu Security Notices USN-8071-1 USN-8071-1: NSS vulnerability Publication date 4 March 2026 Overview NSS could be made to crash or run programs if it received specially crafted network traffic. Releases 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages nss - Network Security Service library Details It was discovered that NSS incorrectly handled memory when performing certain GHASH operations. A remote attacker could use this issue to cause NSS to crash, resulting in a denial of service, or possibly execute arbitrary code. It was discovered that NSS incorrectly handled memory when performing certain GHASH operations. A remote attacker could use this issue to cause NSS to crash, resulting in a denial of service, or possibly execute arbitrary code. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 25.10 questing libnss3 – 2:3.114-1ubuntu0.1 24.04 LTS noble libnss3 – 2:3.98-1ubuntu0.1 22.04 LTS jammy libnss3 – 2:3.98-0ubuntu0.22.04.3 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-2781 CVE-2026-2781