CVE-2026-15170 Heap-based Buffer Overflow in Wireshark

Medium 5.5 Published 8 Jul 2026 Updated 9 Jul 2026

A heap-based buffer overflow in the Z39.50 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-2026-15170?

CVE-2026-15170 is a medium-severity memory corruption vulnerability in Wireshark Wireshark, published on 8 Jul 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

Z39.50 protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service

Weakness: CWE-122

Which versions are affected by CVE-2026-15170?

It affects 1 product.

Products include Wireshark Wireshark.

How do I fix CVE-2026-15170?

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-2026-15170 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15170 exists.

All Wireshark Wireshark vulnerabilities

Sources

Also known as AZL-92117, DEBIAN-CVE-2026-15170, GHSA-hfrj-29vh-pcf2, MINI-347c-c5c8-q3hx, UBUNTU-CVE-2026-15170.