CVE-2026-96423

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{"bugzilla": {"description": "wireshark: Heap-based Buffer Overflow in Wireshark", "id": "2543022", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543022"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in Wireshark. A heap-based buffer overflow in the X11 protocol dissector allows an attacker to cause a Denial of Service (DoS) by injecting malformed packets or providing a crafted capture file. Successful exploitation leads to an application crash, disrupting network packet inspection."], "mitigation": {"lang": "en:us", "value": "Disable the X11 protocol dissector if analyzing network traffic that does not require X11 packet decoding.\nFor command-line analysis using tshark, disable the protocol at runtime:\n```\ntshark --disable-protocol x11 -r <capture_file>\n```\nFor persistent user configuration, add the protocol identifier to the disabled protocols file:\n```\nmkdir -p ~/.config/wireshark\necho \"x11\" >> ~/.config/wireshark/disabled_protos\n```\nIn the Wireshark graphical interface, the dissector can be disabled by navigating to Analyze > Enabled Protocols, searching for \"X11\", unchecking the protocol entry, and clicking OK.\nCaveats: Disabling this dissector prevents Wireshark from decoding and analyzing X11 protocol traffic. Running Wireshark sessions must be restarted for configuration file changes to take effect. Additionally, avoid opening capture files obtained from untrusted sources and avoid running packet capture utilities with elevated root privileges."}, "name": "CVE-2026-96423", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-29T09:30:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-96423\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-96423\nhttps://gitlab.com/wireshark/wireshark/-/work_items/21563\nhttps://www.wireshark.org/security/wnpa-sec-2026-108.html"], "threat_severity": "Moderate"}

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