{"id":"CVE-2026-52811","state":"PUBLISHED","title":"Gogs: UploadRepoFiles writes outside repo working tree via committed parent sym","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.","publishedAt":"2026-06-24T20:31:38.233Z","updatedAt":"2026-06-26T03:55:39.455Z","severity":{"score":9,"label":"Critical","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["gogs gogs"],"affected":[{"vendor":"gogs","product":"gogs","versions":[{"version":"< 0.14.3","status":"affected"}]}],"references":["https://github.com/gogs/gogs/security/advisories/GHSA-89mr-xqfv-758m","https://github.com/gogs/gogs/pull/8332","https://github.com/gogs/gogs/commit/04cb8afbb01d855454e59977a1cdbf522ea1db31","https://github.com/gogs/gogs/releases/tag/v0.14.3"],"weaknesses":["CWE-22","CWE-59","CWE-61"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52811.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52811","state":"PUBLISHED","datePublished":"2026-06-24T20:31:38.233Z","dateUpdated":"2026-06-26T03:55:39.455Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-08T18:11:06.659Z"},"containers":{"cna":{"title":"Gogs: UploadRepoFiles writes outside repo working tree via committed parent sym","descriptions":[{"lang":"en","value":"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":[{"vendor":"gogs","product":"gogs","versions":[{"version":"< 0.14.3","status":"affected"}]}],"references":[{"url":"https://github.com/gogs/gogs/security/advisories/GHSA-89mr-xqfv-758m","name":"https://github.com/gogs/gogs/security/advisories/GHSA-89mr-xqfv-758m","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/gogs/gogs/pull/8332","name":"https://github.com/gogs/gogs/pull/8332","tags":["x_refsource_MISC"]},{"url":"https://github.com/gogs/gogs/commit/04cb8afbb01d855454e59977a1cdbf522ea1db31","name":"https://github.com/gogs/gogs/commit/04cb8afbb01d855454e59977a1cdbf522ea1db31","tags":["x_refsource_MISC"]},{"url":"https://github.com/gogs/gogs/releases/tag/v0.14.3","name":"https://github.com/gogs/gogs/releases/tag/v0.14.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":9,"baseSeverity":"CRITICAL","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-59","lang":"en","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-61","lang":"en","description":"CWE-61: UNIX Symbolic Link (Symlink) Following","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-24T20:31:38.233Z"},"source":{"advisory":"GHSA-89mr-xqfv-758m","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/gogs/gogs/security/advisories/GHSA-89mr-xqfv-758m","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-25T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-52811"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-26T03:55:39.455Z"}}]}}}