CVE-2026-76921: CWE-416: Use After Free in Wireshark Foundation Wireshark
Description
A use-after-free vulnerability exists in the CMS protocol dissector of Wireshark versions 4.4.0 through 4.4.18 and 4.6.0 through 4.6.7. This flaw can cause the application to crash, resulting in a denial of service condition.
CVSS v3.1
Score 5.5medium
Affected software
Wireshark Foundation
Wireshark
pkg:github/wireshark/wiresharkRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-76921 is a use-after-free vulnerability (CWE-416) affecting the CMS protocol dissector in Wireshark versions 4.4.0 to 4.4.18 and 4.6.0 to 4.6.7. The vulnerability allows an attacker to cause a denial of service by triggering a crash in the affected dissector. The CVSS v3.1 base score is 5.5, indicating a medium severity with local attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Potential Impact
Successful exploitation of this vulnerability results in a denial of service due to application crash. There is no impact on confidentiality or integrity according to the CVSS vector. The attack requires local access and user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor Wireshark Foundation advisories for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitLab
- Date Reserved
- 2026-08-19T22:44:30.531Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8633c7acd9273b49b8ad3a
Added to database: 08/19/2026, 22:52:55 UTC
Last enriched: 09/11/2026, 06:02:36 UTC
Last updated: 10/04/2026, 10:02:29 UTC
Views: 51
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