wnpa-sec-2026-108 · X11 protocol dissector crash
Summary
Name: X11 protocol dissector crash
Docid: wnpa-sec-2026-108
Date: September 23, 2026
Affected versions: 4.6.0 to 4.6.8, 4.4.0 to 4.4.18
Fixed versions: 4.6.9, 4.4.19
References:
Wireshark issue 21563.
CVE-2026-96423.
Details
Description
The X11 protocol dissector could crash.
Impact
Discovered by Claude and Ada Logics. We are unaware of any exploits for this issue. It may be possible to make Wireshark crash by injecting a malformed packet onto the wire or by convincing someone to read a malformed packet trace file.
Resolution
Upgrade to Wireshark 4.6.9, 4.4.19 or later.
