{"data":{"id":"af75fe66-33f5-4086-b3d6-69fcdb3c7052","title":"GHSA-x223-p2gf-v735: Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak","summary":"Langflow versions before 1.9.1 allow anyone with network access to upload unlimited amounts of data to the server without logging in, which can exhaust disk space and cause the service to stop working (DoS, or denial-of-service). Additionally, the server reveals the exact file path where uploads are stored, giving attackers information that could help them chain together multiple attacks.","solution":"Upgrade to Langflow version 1.9.1 or later. The fix adds authentication requirements to the upload endpoint (users must log in and own the flow), enforces file size limits (returns HTTP 413 if exceeded), and only reveals file paths to authenticated flow owners.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-x223-p2gf-v735","publishedAt":"2026-06-17T18:43:12.000Z","cveId":"CVE-2026-55450","cweIds":null,"cvssScore":null,"cvssSeverity":"critical","severity":"critical","attackType":["denial_of_service","pii_leakage"],"issueType":"vulnerability","affectedPackages":["langflow@< 1.9.1 (fixed: 1.9.1)"],"affectedVendors":["LangChain"],"affectedVendorsRaw":["Langflow"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0,"patchAvailable":true,"disclosureDate":"2026-06-17T18:43:12.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"trivial","impactType":["availability","confidentiality"],"aiComponentTargeted":"api","llmSpecific":false,"classifierConfidence":0.95,"researchCategory":null,"atlasIds":null}}