CVE-2026-6538 Stack-based Buffer Overflow in Wireshark
A stack-based buffer overflow in the BEEP 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-2026-6538?
CVE-2026-6538 is a medium-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
BEEP protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
Weakness: CWE-121
Which versions are affected by CVE-2026-6538?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-6538?
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-2026-6538 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6538 exists.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as AZL-85172, DEBIAN-CVE-2026-6538, GHSA-f67r-cw3c-gfg6, UBUNTU-CVE-2026-6538.