Buffer overflow in Wireshark

CVE-2026-5405

RDP protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service and possible code execution

Vulnerability class: Buffer Overflow

EPSS: 0.000 (1.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Wireshark
Wireshark Foundation — versions 4.6.0, 4.4.0

Weakness classification (CWE)

References

cve@gitlab.com (Vendor Advisory)
GitLab Issue #21105 (issue-tracking, Exploit, permissions-required, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2026-5405?: CVE-2026-5405 is a high-severity vulnerability in Wireshark, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-05-01.
How severe is CVE-2026-5405?: High severity. CVSS v3 base score is 7.8 out of 10.