What’s Vulnerable › Vulnerabilities

CVE-2026-76921: Use After Free in Wireshark

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-19 · updated 2026-08-31
• Weakness: CWE-416

Description

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

Affected products

• Wireshark Foundation Wireshark: from 4.4.0 before 4.4.18; from 4.6.0 before 4.6.8 — fixed in 4.4.18, 4.6.8

How to fix

Upgrade to a fixed version: Wireshark Foundation Wireshark 4.4.18, 4.6.8. Check the vendor advisory for mitigations.

References

• https://gitlab.com/wireshark/wireshark/-/work_items/21457
• https://gitlab.com/wireshark/wireshark/-/work_items/21458
• https://www.wireshark.org/security/wnpa-sec-2026-83.html

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