ROHC protocol dissector crash in Wireshark 4.6.0 to 4.6.5 and 4.4.0 to 4.4.15 allows denial of service

A flaw was found in the ROHC dissector in Wireshark. This issue occurs when malformed packets are decoded from a pcap file or the network, causing a NULL pointer dereference, resulting in a denial of service.

This issue will cause a crash in Wireshark with no other security impact. Also, this flaw can only be exploited when a malformed pcap file is processed. Due to these reasons, this vulnerability has been rated with a moderate severity. If the ROHC protocol dissector is not being used, it can be disabled via the "Enabled Protocols" dialog box in the Wireshark GUI application. This will also disable the protocol dissector when using "tshark", the command line tool. See the links below for instructions to disable a protocol in Wireshark, specifically the "Control Protocol Dissection" section and the "disabled_protos" configuration file option. https://www.wireshark.org/docs/wsug_html_chunked/ChCustProtocolDissectionSection.html https://www.wireshark.org/docs/wsug_html_chunked/ChAppFilesConfigurationSection.html Red Hat Enterprise Linux 10 Fix deferred 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-2026-9759 https://nvd.nist.gov/vuln/detail/CVE-2026-9759 https://gitlab.com/wireshark/wireshark/-/work_items/21243 https://www.wireshark.org/security/wnpa-sec-2026-51.html