Ubuntu Security Notices USN-8718-1 USN-8718-1: SSSD vulnerability Publication date 3 September 2026 Overview SSSD could be made to crash if it received specially crafted input. Releases 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS 16.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages sssd - System Security Services Daemon Details It was discovered that SSSD did not properly validate authentication token lengths when processing PAM responder requests. A local attacker could possibly use this issue to cause SSSD to crash, resulting in a denial of service. It was discovered that SSSD did not properly validate authentication token lengths when processing PAM responder requests. A local attacker could possibly use this issue to cause SSSD to crash, resulting in a denial of service. Update instructions After a standard system update you need to restart sssd to 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 26.04 LTS resolute sssd-common – 2.12.0-1ubuntu5.4 24.04 LTS noble sssd-common – 2.9.4-1.1ubuntu6.8 22.04 LTS jammy sssd-common – 2.6.3-1ubuntu3.9 20.04 LTS focal sssd-common – 2.2.3-3ubuntu0.13+esm1 Ubuntu Pro Fix available with Ubuntu Pro . 18.04 LTS bionic sssd-common – 1.16.1-1ubuntu1.8+esm1 Ubuntu Pro Fix available with Ubuntu Pro . 16.04 LTS xenial sssd-common – 1.13.4-1ubuntu1.15+esm1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. 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-2026-68743 CVE-2026-68743