CVE-2026-5403 Heap-based Buffer Overflow in Wireshark
A heap-based buffer overflow in the SBC codec allows attackers to cause denial of service or execute arbitrary code 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-2026-5403?
CVE-2026-5403 is a high-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
SBC codec crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service and possible code execution
Which versions are affected by CVE-2026-5403?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-5403?
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-2026-5403 being exploited?
There is no known exploitation of CVE-2026-5403 in the wild and no public exploit code.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as AZL-85322, DEBIAN-CVE-2026-5403, GHSA-fp9p-ww3j-hpfw, UBUNTU-CVE-2026-5403.