{"id":"CVE-2026-73291","state":"PUBLISHED","title":"Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag","description":"Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Prior to version 3.4.0, Seerr's ImageProxy in server/lib/imageproxy.ts uses the upstream ETag and Content-Type response headers to build a cache filename for the unauthenticated GET /avatarproxy/:jellyfinUserId route, allowing a malicious or compromised Jellyfin or Emby server, or a man-in-the-middle attacker on a plaintext media-server connection, to supply traversal sequences that path.join and fs.writeFile normalize outside the cache directory, overwrite /app/dist/index.js or other files, and execute code as the node user after a container restart. This issue is fixed in version 3.4.0.","publishedAt":"2026-08-12T14:48:21.783Z","updatedAt":"2026-08-13T16:23:07.044Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["seerr-team seerr"],"affected":[{"vendor":"seerr-team","product":"seerr","versions":[{"version":"< 3.4.0","status":"affected"}]}],"references":["https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8","https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2","https://github.com/seerr-team/seerr/releases/tag/v3.4.0"],"weaknesses":["CWE-22","CWE-94"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73291.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73291","state":"PUBLISHED","datePublished":"2026-08-12T14:48:21.783Z","dateUpdated":"2026-08-13T16:23:07.044Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-11T19:42:11.450Z"},"containers":{"cna":{"title":"Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag","descriptions":[{"lang":"en","value":"Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Prior to version 3.4.0, Seerr's ImageProxy in server/lib/imageproxy.ts uses the upstream ETag and Content-Type response headers to build a cache filename for the unauthenticated GET /avatarproxy/:jellyfinUserId route, allowing a malicious or compromised Jellyfin or Emby server, or a man-in-the-middle attacker on a plaintext media-server connection, to supply traversal sequences that path.join and fs.writeFile normalize outside the cache directory, overwrite /app/dist/index.js or other files, and execute code as the node user after a container restart. This issue is fixed in version 3.4.0."}],"affected":[{"vendor":"seerr-team","product":"seerr","versions":[{"version":"< 3.4.0","status":"affected"}]}],"references":[{"url":"https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8","name":"https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2","name":"https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2","tags":["x_refsource_MISC"]},{"url":"https://github.com/seerr-team/seerr/releases/tag/v3.4.0","name":"https://github.com/seerr-team/seerr/releases/tag/v3.4.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H","version":"3.1"}}],"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-94","lang":"en","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-12T14:48:21.783Z"},"source":{"advisory":"GHSA-mc6w-69r3-62h8","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-13T16:22:56.578886Z","id":"CVE-2026-73291","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-13T16:23:07.044Z"}}]}}}