{"id":"CVE-2026-55446","summary":"Langflow: Unauthenticated DoS through multipart form boundary file upload","details":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.","aliases":["GHSA-qwqc-p3q8-wcg9","PYSEC-2026-223"],"modified":"2026-07-15T01:49:04.703664543Z","published":"2026-06-23T16:26:17.990Z","database_specific":{"cwe_ids":["CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55446.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55446.json"},{"type":"ADVISORY","url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55446"},{"type":"FIX","url":"https://github.com/langflow-ai/langflow/pull/3923"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/langflow-ai/langflow","events":[{"introduced":"0"},{"fixed":"06013ae86a882e5ab3fe547c272adf5a3620c8a5"}],"database_specific":{"cpe":"cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.0.19"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["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-2026-55446.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}