wnpa-sec-2026-11 · SMB2 dissector infinite loop
Summary
Name: SMB2 dissector infinite loop
Docid: wnpa-sec-2026-11
Date: April 29, 2026
Affected versions: 4.6.0 to 4.6.4, 4.4.0 to 4.4.14
Fixed versions: 4.6.5, 4.4.15
References:
Wireshark issue 21073.
CVE-2026-5407.
Details
Description
The SMB2 protocol dissector could go into an infinite loop.
Impact
Discovered by Brendan Coles. We are unaware of any exploits for this issue. It may be possible to make Wireshark consume excessive CPU resources by injecting a malformed packet onto the wire or by convincing someone to read a malformed packet trace file.
Resolution
Upgrade to Wireshark 4.6.5, 4.4.15 or later.
