Heap-based buffer overflow in Wireshark - CVE-2026-5402
Published: April 30, 2026
Vulnerability identifier: #VU128499
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-5402
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the TLS protocol dissector. A remote attacker can trick a victim to open a specially crafted packet trace file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Wireshark
How to mitigate CVE-2026-5402
Install updates from vendor's website.
Wireshark - update to 4.6.5