{"id":"CVE-2026-22218","aliases":["EUVD-2026-3345","GHSA-gm79-2pvc-wc75","PYSEC-2026-598"],"status":"published","title":"Chainlit \u003c 2.9.4 Arbitrary File Read via /project/element","description":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.09724,"percentile":0.95579,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-01-19T23:14:52Z","modified":"2026-11-08T14:01:12Z","fixes":[{"ecosystem":"PyPI","package":"chainlit","fixed_in":["2.9.4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"PyPI","package":"chainlit","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.4"}]}],"versions":["0.1.0","0.1.1","0.1.101","0.1.102","0.1.103","0.2.0","0.2.1","0.2.101","0.2.102","0.2.103","0.2.104","0.2.105","0.2.106","0.2.107","0.2.108","0.2.109","0.2.110","0.2.111","0.3.0","0.4.0","0.4.1","0.4.101","0.4.2","0.4.3","0.5.0","0.5.1","0.5.2","0.6.0","0.6.1","0.6.2","0.6.3","0.6.4","0.6.401","0.6.402","0.7.0","0.7.1","0.7.2","0.7.3","0.7.301","0.7.400","0.7.500","0.7.501","0.7.600rc0","0.7.600rc1","0.7.601rc0","0.7.602","0.7.602rc0","0.7.603","0.7.604","0.7.604rc0","0.7.604rc1","0.7.604rc2","0.7.700","1.0.0","1.0.0rc0","1.0.0rc1","1.0.0rc2","1.0.0rc3","1.0.100","1.0.101","1.0.200","1.0.300","1.0.301","1.0.400","1.0.401","1.0.500","1.0.501","1.0.502","1.0.503","1.0.504","1.0.505","1.0.506","1.1.0","1.1.0rc0","1.1.0rc1","1.1.101","1.1.200","1.1.201","1.1.202","1.1.300","1.1.300rc0","1.1.300rc1","1.1.300rc2","1.1.300rc3","1.1.300rc4","1.1.300rc5","1.1.301","1.1.302","1.1.303","1.1.304","1.1.305","1.1.306","1.1.400","1.1.400rc0","1.1.400rc1","1.1.401","1.1.402","1.1.403rc0","1.1.404","1.2.0","1.2.0rc0","1.3.0","1.3.0rc0","1.3.0rc1","1.3.1","1.3.2","2.0.0","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.601","2.0.602","2.0.603","2.0.dev0","2.0.dev1","2.0.dev2","2.0rc0","2.0rc1","2.1.0","2.1.1","2.1.2","2.2.0","2.2.1","2.3.0","2.4.0","2.4.0rc0","2.4.1","2.4.2","2.4.201","2.4.3","2.4.301","2.4.302","2.4.400","2.5.5","2.6.0","2.6.1","2.6.2","2.6.3","2.6.4","2.6.5","2.6.6","2.6.7","2.6.8","2.6.9","2.7.0","2.7.1","2.7.1.1","2.7.2","2.8.0","2.8.1","2.8.2","2.8.3","2.8.4","2.8.5","2.9.0","2.9.1","2.9.2","2.9.3"]}],"products":[{"vendor":"chainlit","product":"chainlit"}],"references":[{"url":"https://github.com/Chainlit/chainlit/releases/tag/2.9.4","tags":["release-notes","patch","Product","Release Notes","fix","advisory"]},{"url":"https://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-expose-data-enable-cloud-takeover","tags":["technical-description","exploit","Exploit","Mitigation","Third Party Advisory","evidence"]},{"url":"https://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-element","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-22218","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gm79-2pvc-wc75"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22218.json","tags":["advisory"]},{"url":"https://github.com/Chainlit/chainlit","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-22218","title":"Chainlit \u003c 2.9.4 Arbitrary File Read via /project/element","description":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.","status":"published","published":"2026-01-19T23:14:52.969Z","modified":"2026-11-08T14:01:12.271Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-08T15:43:32.737211Z"}],"euvd":[{"id":"EUVD-2026-3345","description":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.","status":"published","published":"2026-01-19T23:14:52Z","modified":"2026-11-08T14:01:12Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-08T15:13:09.785497Z"}],"ghsa":[{"id":"GHSA-gm79-2pvc-wc75","title":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project...","description":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.","status":"published","published":"2026-01-20T00:30:28Z","modified":"2026-02-02T21:31:27Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:06:00.828476Z"}],"nvd":[{"id":"CVE-2026-22218","description":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.","status":"published","published":"2026-01-20T00:15:48.91Z","modified":"2026-07-14T16:16:49.617Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:04.066712Z"}],"osv":[{"id":"CVE-2026-22218","title":"Chainlit \u003c 2.9.4 Arbitrary File Read via /project/element","description":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.","status":"published","published":"2026-01-19T23:14:52.969Z","modified":"2026-11-09T02:31:00.025075647Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-09T03:16:44.651171Z"},{"id":"PYSEC-2026-598","description":"Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service.","status":"published","published":"2026-01-20T00:15:48.91Z","modified":"2026-07-02T08:45:06.090293533Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:57.671918Z"}]}}