{"id":"CVE-2026-76879","title":"wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash (CVE-2026-76879)","summary":"A flaw in Wireshark's C12.22 protocol dissector allows remote attackers to trigger a Denial of Service (DoS). By sending a specially crafted network packet or capture file, an attacker can crash the application, disrupting network analysis…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-617","CWE-121"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 10)","affected":["enterprise_linux_appstream_v_10","enterprise_linux_codeready_linux_builder_v_10"],"patched":["enterprise_linux_appstream_v_10","enterprise_linux_codeready_linux_builder_v_10"],"published":"2026-08-19","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:23:50+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76879.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76879.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-76879"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520098"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-76879"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76879"},{"url":"https://gitlab.com/wireshark/wireshark/-/work_items/21480"},{"url":"https://www.wireshark.org/security/wnpa-sec-2026-89.html"},{"url":"https://access.redhat.com/errata/RHSA-2026:84721"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00312,"epssPercentile":0.23892,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-08-20T15:08:32.060760Z"},"scores":{"vendor":6.5,"cna":7.5},"ingestedAt":"2026-09-17T19:26:25.344Z","slug":"CVE-2026-76879","body":"## Overview\n\nA flaw in Wireshark's C12.22 protocol dissector allows remote attackers to trigger a Denial of Service (DoS). By sending a specially crafted network packet or capture file, an attacker can crash the application, disrupting network analysis capabilities.\n\n## Vendor advisories\n\n- **RHSA-2026:84721** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84721)\n- **Red Hat VEX** · Moderate · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76879.json)\n\n**wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash** — rated Moderate by Red Hat. Released 2026-08-19, updated 2026-10-19.\n\nFixed:\n\n- Red Hat Enterprise Linux AppStream (v. 10)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:84721\n\nWorkarounds / mitigations:\n\n- Avoid analyzing capture files or live traffic from untrusted sources. If ANSI C12.22 parsing is not required, disable the dissector by unchecking C1222 under Analyze > Enabled Protocols in Wireshark, or by executing tshark with the -d c1222,0 flag.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":212303,"id":"CVE-2026-76879","ts":1790668141997,"field":"cvss","old":"7.5","new":"6.5"},{"seq":212302,"id":"CVE-2026-76879","ts":1790668141997,"field":"severity","old":"high","new":"medium"}]}