CVE-2026-76886 Heap-based Buffer Overflow in Wireshark
A heap-based buffer overflow in the C12.22 dissector allows attackers to cause a denial of service via crafted packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-76886?
CVE-2026-76886 is a high-severity memory corruption vulnerability in Wireshark Wireshark, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
C12.22 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-2026-76886?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-76886?
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-2026-76886 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-76886 exists.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as AZL-96779, CLSA-2026-1792635672, DEBIAN-CVE-2026-76886, GHSA-wrhv-64xq-9g54, MINI-6mxm-rgwr-4fx9, UBUNTU-CVE-2026-76886.