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3.1
CVE-2026-96282: Flatpak extension can reveal host file locations
CVE-2026-96282 · published 21 days ago
Summary
Flatpak extensions on affected Linux systems can be tricked into checking for the presence of any file or directory on the host computer and reporting back what it finds. This lets sandboxed apps learn the layout of the host system or see directory listings they shouldn't. Update the Flatpak packages to the latest versions provided by your Linux distribution to apply the fix.
What to do
- Update debian flatpak to version 1.16.6-1~deb13u2.
- Update debian flatpak to version 1.18.1-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:Pro:18.04:LTS | canonical | flatpak | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | flatpak | All versions |
| Ubuntu:Pro:22.04:LTS | canonical | flatpak | All versions |
| Ubuntu:Pro:24.04:LTS | canonical | flatpak | All versions |
| Ubuntu:26.04:LTS | canonical | flatpak | All versions |
| Debian:12 | debian | flatpak | All versions |
| Debian:13 | debian | flatpak |
< 1.16.6-1~deb13u2 Fix: upgrade to 1.16.6-1~deb13u2
|
| Debian:14 | debian | flatpak |
< 1.18.1-1 Fix: upgrade to 1.18.1-1
|
| – | red hat | red hat enterprise linux 10 | All versions |
| – | red hat | red hat enterprise linux 7 | All versions |
| – | red hat | red hat enterprise linux 8 | All versions |
| – | red hat | red hat enterprise linux 9 | All versions |
Original advisory text
Flatpak: flatpak: extension metadata path traversal file existence oracle
A malicious Flatpak extension can probe the host filesystem to determine what files and directories exist at arbitrary paths, and host directory listings can be disclosed to sandboxed applications using the extension. Additionally, unvalidated extension metadata can cause extension content to be mounted at unintended locations inside the sandbox.
References
- https://ubuntu.com/security/CVE-2026-96282 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-96282 Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-96282
- https://bugzilla.redhat.com/show_bug.cgi?id=2539422
- https://security-tracker.debian.org/tracker/CVE-2026-96282 Vendor Advisory
- https://github.com/flatpak/flatpak/security/advisories/GHSA-w69g-9x8j-7p8f
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Severity
3.1
Low
Type
CWE-59Link Following
Timeline
Published27 Sep 2026
Updated19 Oct 2026
First seen24 Sep 2026
Sources
UBUNTU-CVE-2026-96282 · OSV
CVE-2026-96282 · NVD
CVE-2026-96282 · MITRE
DEBIAN-CVE-2026-96282 · OSV
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