{"id":"CVE-2026-55446","aliases":["GHSA-qwqc-p3q8-wcg9","PYSEC-2026-223"],"url":"https://o3.security/vulnerability/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.","published":"2026-06-23T16:26:17.990Z","modified":"2026-07-15T01:49:04.703664543Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00347,"percentile":0.27444,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"langflow","fixedVersion":"1.0.19"}],"fix":{"url":"https://github.com/langflow-ai/langflow/pull/3923","label":"langflow-ai/langflow#3923"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:04.703664543Z"}}