{"id":"CVE-2026-55446","published":"2026-06-23T16:26:17Z","modified":"2026-06-23T17:56:37Z","title":"Langflow: Unauthenticated DoS through multipart form boundary file upload","vendor":"langflow-ai","product":"langflow","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00581,"percentile":0.47641,"provenance":"source"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"references":[{"url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/langflow-ai/langflow/pull/3923","tags":["x_refsource_MISC"]}],"priority":{"score":14.8,"factors":[{"name":"EPSS percentile","points":9.53},{"name":"CVSS severity","points":5.25}]},"vendorSlug":"langflow-ai","affectedVersions":[{"vendor":"langflow-ai","product":"langflow","versions":["< 1.0.19"]}],"affected":[{"ecosystem":"PyPI","package":"langflow","vulnerableRanges":["<1.0.19"],"patched":["1.0.19"],"from":["GHSA-qwqc-p3q8-wcg9","PYSEC-2026-223"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-38515","exploited":false,"provenance":"source"}}