CVE-2026-5657 Double Free in Wireshark
A double free vulnerability in the iLBC codec allows attackers to cause a denial of service in Wireshark.
- 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-2026-5657?
CVE-2026-5657 is a medium-severity use after free 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
iLBC codec crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
Weakness: CWE-415
Which versions are affected by CVE-2026-5657?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-5657?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-5657 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5657 exists.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as AZL-85136, DEBIAN-CVE-2026-5657, GHSA-wvxj-3gq6-2mg4, UBUNTU-CVE-2026-5657.