wnpa-sec-2026-04 · HTTP3 dissector infinite loop
Summary
Name: HTTP3 dissector infinite loop
Docid: wnpa-sec-2026-04
Date: Jan 14, 2026
Affected versions: 4.6.0 to 4.6.2, 4.4.0 to 4.4.12
Fixed versions: 4.6.3, 4.4.13
References:
Wireshark issue 20944.
Details
Description
The HTTP3 dissector could go into an infinite loop when decrypting traffic.
Impact
Discovered by Tom Needham. We are unaware of any exploits for this issue. It may be possible to make Wireshark consume excessive CPU resources by convincing someone to read a malformed packet trace file.
Resolution
Upgrade to Wireshark 4.6.3, 4.4.13 or later.
