Ubuntu Security Notices USN-8355-1 USN-8355-1: SSSD vulnerability Publication date 1 June 2026 Overview SSSD could be made to crash if it received specially crafted input. Releases 26.04 LTS 25.10 24.04 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 handle raw bytes in the PAM passkey responder. A local attacker could possibly use this issue to cause the SSSD PAM responder to crash, resulting in a denial of service. It was discovered that SSSD did not properly handle raw bytes in the PAM passkey responder. A local attacker could possibly use this issue to cause the SSSD PAM responder to crash, resulting in a denial of service. 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 26.04 LTS resolute sssd – 2.12.0-1ubuntu5.1 25.10 questing sssd – 2.10.1-2ubuntu5.2 24.04 LTS noble sssd – 2.9.4-1.1ubuntu6.5 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-2026-6245 CVE-2026-6245