CVE-2026-76889 Heap-based Buffer Overflow in Wireshark

Medium 4.7 Published 19 Aug 2026 Updated 17 Sep 2026

A heap-based buffer overflow in the UMTS FP dissector allows attackers to cause a denial of service via crafted packets.

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-2026-76889?

CVE-2026-76889 is a medium-severity memory corruption vulnerability in Wireshark Wireshark, published on 19 Aug 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

UMTS FP protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

Weakness: CWE-122

Which versions are affected by CVE-2026-76889?

It affects 1 product.

Products include Wireshark Wireshark.

How do I fix CVE-2026-76889?

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-2026-76889 being exploited?

There is no known exploitation of CVE-2026-76889 in the wild and no public exploit code.

All Wireshark Wireshark vulnerabilities

Sources

Also known as AZL-96830, DEBIAN-CVE-2026-76889, GHSA-gjp8-9g86-732v, MINI-vv98-237p-rfc3, UBUNTU-CVE-2026-76889.