Buffer overflow in Wireshark
CVE-2026-5402
TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution
Vulnerability class: Buffer Overflow
EPSS: 0.004 (31.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Wireshark
- Wireshark Foundation — versions 4.6.0
Weakness classification (CWE)
References
- cve@gitlab.com (Vendor Advisory)
- cve@gitlab.com (issue-tracking, Exploit, permissions-required, Issue Tracking)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-5402?
- CVE-2026-5402 is a high-severity vulnerability in Wireshark, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-04-30.
- How severe is CVE-2026-5402?
- High severity. CVSS v3 base score is 8.8 out of 10.