Packages
- flatpak - Application deployment framework for desktop apps
Details
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removing outdated ld.so cache files.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)
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removing outdated ld.so cache files.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)
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 | ||
|---|---|---|---|
| 24.04 LTS noble | flatpak – 1.14.6-1ubuntu0.1+esm1 | ||
| libflatpak0 – 1.14.6-1ubuntu0.1+esm1 | |||
| 22.04 LTS jammy | flatpak – 1.12.7-1ubuntu0.1+esm1 | ||
| libflatpak0 – 1.12.7-1ubuntu0.1+esm1 | |||
| 20.04 LTS focal | flatpak – 1.6.5-0ubuntu0.5+esm1 | ||
| libflatpak0 – 1.6.5-0ubuntu0.5+esm1 | |||
| 18.04 LTS bionic | flatpak – 1.0.9-0ubuntu0.4+esm1 | ||
| libflatpak0 – 1.0.9-0ubuntu0.4+esm1 | |||
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