CVE-2026-5402 Heap-based Buffer Overflow in Wireshark
Heap-based buffer overflow in Wireshark's TLS dissector allows attackers to cause denial of service or execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-5402?
CVE-2026-5402 is a high-severity memory corruption vulnerability in Wireshark Wireshark, published on 30 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution
Weakness: CWE-122
Which versions are affected by CVE-2026-5402?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-5402?
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-2026-5402 being exploited?
There is no known exploitation of CVE-2026-5402 in the wild and no public exploit code.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as DEBIAN-CVE-2026-5402, GHSA-f6fp-9f7c-rfwv, UBUNTU-CVE-2026-5402.