CVE-2026-96423 Heap-based Buffer Overflow in Wireshark
A heap-based buffer overflow in the X11 protocol dissector allows attackers to cause a denial of service in Wireshark.
- 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-2026-96423?
CVE-2026-96423 is a medium-severity memory corruption vulnerability in Wireshark Wireshark, published on 29 Sep 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
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
Which versions are affected by CVE-2026-96423?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-96423?
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-2026-96423 being exploited?
There is no known exploitation of CVE-2026-96423 in the wild and no public exploit code.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as AZL-105003, DEBIAN-CVE-2026-96423, GHSA-969r-pwxc-fjq2, MINI-p8xc-c3x3-frwp, UBUNTU-CVE-2026-96423.