CVE-2026-73539: Argument Injection

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.

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Weakness Type (CWE)

CWE-88 CWE-88

References

Other References

https://blog.gitea.com/release-of-1.27.2/ https://github.com/go-gitea/gitea/pull/38885 https://github.com/go-gitea/gitea/pull/38898 https://github.com/go-gitea/gitea/releases/tag/v1.27.2 https://github.com/go-gitea/gitea/security/advisories/GHSA-579w-82gf-89m2

Frequently Asked Questions

What is CVE-2026-73539? +

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.

How do I check if I'm vulnerable to CVE-2026-73539? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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