CVE-2026-34079 Flatpak affected by arbitrary file deletion on the host filesystem
Flatpak apps can delete arbitrary files on the host filesystem due to improper path validation in cache removal, requiring an upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34079?
CVE-2026-34079 is a high-severity path traversal vulnerability in flatpak, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the caching for ld.so removes outdated cache files without properly checking that the app controlled path to the outdated cache is in the cache directory. This allows Flatpak apps to delete arbitrary files on the host. This vulnerability is fixed in 1.16.4.
Weakness: CWE-22
Which versions are affected by CVE-2026-34079?
It affects 1 product.
Products include Flatpak Flatpak.
How do I fix CVE-2026-34079?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-34079 being exploited?
There is no known exploitation of CVE-2026-34079 in the wild and no public exploit code.
Other vulnerabilities in flatpak
- CVE-2023-28100 TIOCLINUX can send commands outside sandbox if running on a virtual console
- CVE-2026-34078 Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
- CVE-2019-10063 Security feature bypass in n/a
- CVE-2018-6560 Security feature bypass in n/a
- CVE-2023-28101 Flatpak metadata with ANSI control codes can cause misleading terminal output
Sources
Also known as CLSA-2026-1776949031, CLSA-2026-1777542671, CLSA-2026-1777890711, DEBIAN-CVE-2026-34079, GHSA-p29x-r292-46pp, UBUNTU-CVE-2026-34079.