CVE-2026-11853 Path traversal in debusine
Attackers can create arbitrary symbolic links via malicious Debian package manifests, potentially overwriting files and escalating privileges on build workers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-11853?
CVE-2026-11853 is a medium-severity path traversal vulnerability in Debian debusine, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Debusine is an integrated solution to build, distribute and maintain a Debian-based distribution. Debian source packages (.dsc) and upload artifacts (.changes) are manifest files that name the files that make up the artifact. The parser used to read these files in Debusine accepted arbitrary fully user-controlled paths. The mergeuploads task could be abused to create arbitrary symbolic links on a worker, overwriting any file that the worker user has access to.
Weakness: CWE-59
Which versions are affected by CVE-2026-11853?
How do I fix CVE-2026-11853?
Apply the vendor's patch.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-11853 being exploited?
There is no known exploitation of CVE-2026-11853 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-11853, GHSA-29fv-9q46-q5g2, UBUNTU-CVE-2026-11853.