Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-19T22:44:00 wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CWE-617

C12.22 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

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 capabilities.

A denial of service flaw in Wireshark's C12.22 protocol dissector allows a remote attacker to crash the application via a crafted network packet, disrupting network analysis operations without requiring user interaction or privileges. RHEL 9 and older versions are not affected. 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. Red Hat Enterprise Linux 10 Affected wireshark Red Hat Enterprise Linux 6 Not affected wireshark Red Hat Enterprise Linux 7 Not affected wireshark Red Hat Enterprise Linux 8 Not affected wireshark Red Hat Enterprise Linux 9 Not affected wireshark https://www.cve.org/CVERecord?id=CVE-2026-76879 https://nvd.nist.gov/vuln/detail/CVE-2026-76879 https://gitlab.com/wireshark/wireshark/-/work_items/21480 https://www.wireshark.org/security/wnpa-sec-2026-89.html