{"id":"CVE-2026-5027","summary":"Langflow - Path Traversal Arbitrary File Write via upload_user_file","details":"The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').","modified":"2026-08-20T03:54:27.480216497Z","published":"2026-03-27T14:54:53.609Z","database_specific":{"cna_assigner":"tenable","cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5027.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"last_affected":"0"}]}]},"references":[{"type":"WEB","url":"https://www.tenable.com/security/research/tra-2026-26"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5027.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5027"},{"type":"PACKAGE","url":"https://github.com/langflow-ai/langflow"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/langflow-ai/langflow","events":[{"introduced":"0"},{"fixed":"a47f2ad17eb662e940c550cfccb64a87dddd7e0b"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.9.0"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:langflow:langflow:*:-:*:*:*:*:*:*"}}],"versions":["1.8.1","1.8.0.rc6","1.8.0.rc5","1.8.0.rc4","1.8.0.rc3","1.8.0.rc2","1.8.0.rc1","1.8.0.rc0","1.5.0.post1","1.4.2","1.4.1","1.4.0","1.3.4","1.3.3","1.3.2","1.3.1","1.3.0","1.2.0","1.1.4","1.1.3","1.1.2","v1.1.1","v1.1.0","v1.0.19","v1.0.18","v1.0.17","v1.0.16","v1.0.15","v1.0.13","v1.0.14","v1.0.12","v1.0.11","v1.0.10","v1.0.9","v1.0.8","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v0.6.19","v0.6.18","v0.6.17","v0.6.16","v0.6.15","v0.6.14","v0.6.13","v0.6.12","v0.6.11","v0.6.10","v0.6.9","v0.6.8","v0.6.7","v0.6.6","v0.6.5","v0.6.4","v0.6.3","v0.6.3a6","v0.6.3a5","v0.6.3a4","v0.6.3a3","v0.6.3a2","v0.6.3a1","v0.6.3a0","v0.6.2","v0.6.1","v0.6.0","v0.6.0rc1","v0.5.12","v0.5.11","v0.5.10","v0.5.9","v0.5.8","v0.6.0a0","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.5.0b6","v0.5.0b5","v0.5.0b4","v0.5.0b3","v0.5.0b2","v0.5.0b0","v0.5.0a6","v0.5.0a5","v0.5.0a4","v0.5.0a3","v0.5.0a2","v0.4.21","v0.5.0a1","v0.4.20","v0.4.19","v0.4.18","v0.5.0a0","v0.4.17","v0.4.16","v0.4.15","v0.4.14","v0.4.12","v0.4.11","v0.4.10","v0.4.9","v0.4.8","v0.4.7","v0.4.6","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.4","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.13","v0.2.12","v0.2.11","v0.2.10","v0.2.9","v0.2.8","v0.2.7","v0.2.6","v0.2.5","v0.2.4","v0.2.0","v0.2.3","v0.2.2","v0.2.1","v0.1.7","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.0","v0.0.89","v0.0.88","v0.0.87","v0.0.86","v0.0.85","v0.0.84","v0.0.83","v0.0.82","v0.0.81","v0.0.80","v0.0.79","v0.0.78","v0.0.77","v0.0.76","v0.0.75","v0.0.74","v0.0.73","v0.0.72","v0.0.71","v0.0.70","v0.0.69","v0.0.31"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5027.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}