CVE-2026-76921

Analyzed Analyzed - Analysis Complete

CMS Protocol Dissector DoS in Wireshark

Publication date: 2026-08-19

Last updated on: 2026-08-31

Assigner: GitLab Inc.

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-19

Last Modified

2026-08-31

Generated

2026-09-09

AI Q&A

2026-08-20

EPSS Evaluated

2026-09-07

NVD

CVE-2026-76921

EUVD

EUVD-2026-63170

Affected Vendors & Products

Vendor	Product	Version / Range
wireshark	wireshark	From 4.6.0 (inc) to 4.6.8 (exc)
wireshark	wireshark	From 4.4.0 (inc) to 4.4.18 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability is a denial of service issue in CMS protocol dissectors affecting versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18. It causes a crash in the dissector, leading to service disruption.

Detection Guidance

This vulnerability causes a crash in the CMS protocol dissector, leading to a denial of service. Detection may involve monitoring for crashes or unusual traffic patterns in network traffic analysis tools like Wireshark. Check for versions 4.6.0 to 4.6.7 or 4.4.0 to 4.4.18 of the affected software.

Impact Analysis

The vulnerability allows attackers to cause a denial of service by crashing the CMS protocol dissector. This can disrupt services relying on affected versions, leading to downtime or unavailability.

Compliance Impact

This vulnerability causes a denial of service due to a CMS protocol dissector crash. It does not directly affect compliance with GDPR or HIPAA as it does not involve data breaches or unauthorized access. However, service disruptions could impact availability requirements under these regulations.

Mitigation Strategies

Update the affected CMS protocol dissector to a version outside the vulnerable range (4.6.0 to 4.6.7 and 4.4.0 to 4.4.18). Disable or restrict access to the dissector if immediate updates are not possible.

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