Gogs up to 0.14.2 on Linux /hooks/post-receive path traversal

Summaryinfo

A vulnerability was found in Gogs up to 0.14.2 on Linux. It has been declared as critical. The affected element is an unknown function of the file /hooks/post-receive. Such manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-52811. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Gogs up to 0.14.2 on Linux. Affected by this issue is some unknown processing of the file /hooks/post-receive. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Gogs is an open source self-hosted Git service. Prior to 0.14.3, (*Repository).UploadRepoFiles checks for symlinks only on the leaf of the upload target (osx.IsSymlink(targetPath)). The siblings UpdateRepoFile, DeleteRepoFile, and GetDiffPreview use hasSymlinkInPath, which lstats every component — UploadRepoFiles is the lone outlier. An attacker with repo-write access plus a multipart upload whose filename contains a literal backslash (preserved by filepath.Base on Linux, then converted to / by pathx.Clean) redirects the write through a previously-committed directory symlink. iox.CopyFile opens the destination with os.Create (no O_NOFOLLOW), so the kernel follows the parent symlink and writes attacker bytes anywhere the gogs UID can write — ~git/.ssh/authorized_keys → SSH foothold, or .git/hooks/post-receive → next-push RCE. This vulnerability is fixed in 0.14.3.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-52811 since 06/08/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 0.14.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 04cb8afbb01d855454e59977a1cdbf522ea1db31 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Gogs

Version

• 0.14.0
• 0.14.1
• 0.14.2

License

• open-source

Website

• Product: https://github.com/gogs/gogs/

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