Use After Free in Wireshark Foundation

CVE-2026-76921

CMS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Wireshark Foundation

Weakness classification (CWE)

CWE-416 — Use After Free

References

Frequently asked questions

What is CVE-2026-76921?: CVE-2026-76921 is a medium-severity vulnerability in Wireshark Foundation, classified under Use After Free. CVSS score: 5.5/10. Published 2026-08-19.
How severe is CVE-2026-76921?: Medium severity. CVSS v3 base score is 5.5 out of 10.