CVE-2026-34078 · cross-distro fix matrix

CVE-2026-34078: Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2026-34078 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

flatpak→ fixed in1.14.10-1~deb12u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y flatpak
```

Debian trixie

Source: Debian Security Tracker

flatpak→ fixed in1.16.6-1~deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y flatpak
```

Alpine edge

Source: Alpine secdb

flatpak→ fixed in1.16.4-r0
```
apk update && apk add --upgrade flatpak
```

Are YOU affected by CVE-2026-34078?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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