[code.gitea.io/gitea] Path Traversal in Gitea

The avatar middleware in Gitea before 1.13.6 allows Directory Traversal via a crafted URL.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-29134
• https://github.com/go-gitea/gitea/pull/15125/files
• https://github.com/go-gitea/gitea/releases
• https://github.com/go-gitea/gitea/releases/tag/v1.13.6
• https://github.com/advisories/GHSA-h3q4-vmw4-cpr5