CVE-2026-5405 Heap-based Buffer Overflow in Wireshark

High 7.8 Published 30 Apr 2026 Updated 15 Jul 2026

A heap-based buffer overflow in the RDP dissector allows attackers to cause denial of service or execute arbitrary code.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2026-5405?

CVE-2026-5405 is a high-severity memory corruption vulnerability in Wireshark Wireshark, published on 30 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

RDP protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service and possible code execution

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2026-5405?

It affects 1 product.

Products include Wireshark Wireshark.

How do I fix CVE-2026-5405?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-5405 being exploited?

There is no known exploitation of CVE-2026-5405 in the wild and no public exploit code.

All Wireshark Wireshark vulnerabilities

Sources

Also known as AZL-85325, DEBIAN-CVE-2026-5405, GHSA-6p69-v349-83rh, UBUNTU-CVE-2026-5405.