CVE-2026-3203 Buffer Over-read in Wireshark
A buffer over-read in the RF4CE dissector allows attackers to crash Wireshark, causing a denial of service.
- 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-2026-3203?
CVE-2026-3203 is a medium-severity memory corruption vulnerability in Wireshark Wireshark, published on 25 Feb 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
RF4CE Profile protocol dissector crash in Wireshark 4.6.0 to 4.6.3 and 4.4.0 to 4.4.13 allows denial of service
Weakness: CWE-126
Which versions are affected by CVE-2026-3203?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-3203?
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-2026-3203 being exploited?
There is no known exploitation of CVE-2026-3203 in the wild and no public exploit code.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as AZL-78339, DEBIAN-CVE-2026-3203, GHSA-qrr9-2772-633f, UBUNTU-CVE-2026-3203.