{"id":"CVE-2026-52811","summary":"Gogs: UploadRepoFiles writes outside repo working tree via committed parent sym","details":"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 \u003crepo\u003e.git/hooks/post-receive → next-push RCE. This vulnerability is fixed in 0.14.3.","aliases":["GHSA-89mr-xqfv-758m","GO-2026-5249"],"modified":"2026-07-15T01:49:04.850215794Z","published":"2026-06-24T20:31:38.233Z","database_specific":{"cwe_ids":["CWE-22","CWE-59","CWE-61"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52811.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/gogs/gogs/releases/tag/v0.14.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52811.json"},{"type":"ADVISORY","url":"https://github.com/gogs/gogs/security/advisories/GHSA-89mr-xqfv-758m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52811"},{"type":"FIX","url":"https://github.com/gogs/gogs/commit/04cb8afbb01d855454e59977a1cdbf522ea1db31"},{"type":"FIX","url":"https://github.com/gogs/gogs/pull/8332"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gogs/gogs","events":[{"introduced":"0"},{"fixed":"04cb8afbb01d855454e59977a1cdbf522ea1db31"},{"fixed":"3ba8aca90e17e5410b7e8b227c9f29256ac3e875"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.14.3"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.14.2-rc.1","v0.14.2","v0.14.1-rc.1","v0.14.1","v0.14.0-rc.1","v0.14.0","latest-commit-build","v0.11.91","v0.11.86","v0.11.79","v0.11.66","v0.11.53","v0.11.43","v0.11.34","v0.11.33","v0.11.29","v0.11.19","v0.11.4","v0.11","v0.11rc","v0.10.18","v0.10.8","v0.10","v0.10rc","v0.9.141","v0.9.128","v0.9.113","v0.9.97","v0.9.71","v0.9.60","v0.9.48","v0.9.46","v0.9.13","v0.9.0","v0.8.43","v0.8.25","v0.8.10","v0.8.0","v0.7.33","v0.7.22","v0.7.19","v0.7.6","v0.7.0","v0.6.15","v0.6.9","v0.6.3","v0.6.1","v0.5.13","v0.5.11","v0.5.9","v0.5.8","v0.5.5","v0.5.2","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52811.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}]}