critical

CVE-2026-52811

Gogs: UploadRepoFiles writes outside repo working tree via committed parent sym

Published 24 Jun 2026Modified 26 Jun 2026CWE 22, 59, 61

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

GHSA9.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Trivy's own label is CRITICAL. Rated critical by GHSA.

Description

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 <repo>.git/hooks/post-receive → next-push RCE. This vulnerability is fixed in 0.14.3.

Affected packages and fixed versions

Source	Package	Fixed in
go::GitHub Security Advisory Go	gogs.io/gogs	0.14.3
rapidfort alpine 3.20	gogs	no fix listed
rapidfort alpine 3.21	gogs	no fix listed
rapidfort alpine 3.22	gogs	no fix listed
rapidfort alpine 3.23	gogs	no fix listed
rapidfort alpine 3.24	gogs	no fix listed

References

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