{"cve":"CVE-2026-55446","nvd":{"published":"2026-06-23T17:17:08.410","modified":"2026-10-25T23:10:00.167","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://github.com/langflow-ai/langflow/pull/3923","https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9","https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9"],"products":["langflow:langflow"],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-55446","score":0.00581,"percentile":0.47483,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-qwqc-p3q8-wcg9","url":"https://osv.dev/vulnerability/GHSA-qwqc-p3q8-wcg9","summary":"Langflow: Unauthenticated DoS through multipart form boundary file upload","modified":"2026-06-26T00:11:24.844850404Z","packages":[{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow","ranges":["<1.0.19"],"fixed":["1.0.19"]}]},{"id":"PYSEC-2026-223","url":"https://osv.dev/vulnerability/PYSEC-2026-223","summary":"","modified":"2026-06-26T00:00:06.012034837Z","packages":[{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow","ranges":["<1.0.19"],"fixed":["1.0.19"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}