CVE-2026-73539 Gitea external renderer argument injection and code execution
Attackers can inject arguments into external renderer commands to execute arbitrary code as the service account if a susceptible renderer is configured.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73539?
CVE-2026-73539 is a high-severity command injection vulnerability in Gitea, published on 14 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication.
Weakness: CWE-88
Which versions are affected by CVE-2026-73539?
How do I fix CVE-2026-73539?
No fix has been published for CVE-2026-73539 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-73539 being exploited?
There is no known exploitation of CVE-2026-73539 in the wild and no public exploit code.
Sources
Also known as GHSA-579w-82gf-89m2.