Ubuntu Security Notice

Security Notices
Ubuntu Updates .NET 8, 10, and 11 for Three Vulnerabilities
10/29/2026

Ubuntu USN-8958-1 updates .NET 8, 10, and 11 for three flaws. Match release and package scope, update, restart workloads, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8957-1 Fixes authd Account-Matching Flaw
10/27/2026

Ubuntu USN-8957-1 fixes authd account matching. Update Ubuntu 26.10 to authd 0.7.1, restart the service, validate identity mapping, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8954-1 Fixes zlib Heap Buffer Overflow
10/22/2026

Ubuntu USN-8954-1 fixes a zlib heap overflow. Install release-specific packages, restart dependent services, test workloads, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8952-1 Fixes Tornado Request-Handling Flaws
10/22/2026

Ubuntu USN-8952-1 fixes Tornado request-handling flaws. Update release-specific packages, restart dependent services, test web paths, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8890-2 Extends libsoup Fixes to Ubuntu 26.10
10/21/2026

Ubuntu USN-8890-2 extends eight libsoup fixes to Ubuntu 26.10. Update libsoup3, restart consumers, test HTTP workflows, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8951-1 Fixes c-ares DNS Parsing Flaws
10/21/2026

Ubuntu USN-8951-1 fixes c-ares DNS parsing flaws. Update release-specific packages, restart consumers, validate resolution, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8947-1 Removes Compromised CA Trust from NSS
10/21/2026

Ubuntu USN-8947-1 removes compromised CA trust from NSS. Update supported or ESM packages, restart consumers, validate TLS, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8950-1 Fixes Poppler PDF Denial of Service
10/21/2026

Ubuntu USN-8950-1 fixes a Poppler PDF denial of service. Update matching packages, test document workflows, monitor crashes, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8948-1 and USN-8948-2 Fix Critical PHP RCE Flaws
10/21/2026

Ubuntu USN-8948-1 and -2 fix two critical PHP RCE flaws across current and ESM releases. Update packages, restart workers, and retain evidence.

Read this guide
Security Notices
Ubuntu USN-8946-1 Fixes Unbound DNS Vulnerabilities
10/21/2026

Ubuntu USN-8946-1 fixes ten Unbound issues, including denial of service and cache poisoning. Update matching packages, validate DNS, and retain evidence.

Read this guide