Input validation error in Wireshark - CVE-2026-6521
Published: April 30, 2026
Vulnerability identifier: #VU128649
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-6521
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Wireshark.org
Affected software:
Wireshark
Wireshark
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the OpenFlow v5 protocol dissector when parsing malformed packets or packet trace files. A remote attacker can inject a malformed packet onto the wire or trick the victim into opening a malformed packet trace file to cause a denial of service.
User interaction is required when exploitation is performed via a crafted packet trace file.
How to mitigate CVE-2026-6521
Install security update from vendor's website.