Ubuntu Security Advisories

It was discovered that Flatpak did not properly validate paths in sandbox-expose options. A malicious or compromised Flatpak app could use app-controlled symlinks to access arbitrary host files and gain code execution in the host context. This issue was addressed in Ubuntu Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-34078) It was discovered that Flatpak did not properly validate paths when removing outdated ld.so cache files. A malicious or compromised Flatpak app could use this issue to delete arbitrary files on the host. (CVE-2026-34079)

Weeraphat Srisutham discovered that the .NET watch BrowserRefreshServer did not properly validate cross-origin WebSocket connections. An attacker could possibly use this issue to expose sensitive information. (CVE-2026-58649) Rajesh Chada discovered that the .NET watch AspireServerService improperly exposed information through the use of certain arguments. An attacker could possibly use this issue to elevate privileges and execute arbitrary code. (CVE-2026-69806)