CVE-2026-76886

Analyzed Analyzed - Analysis Complete

C12.22 Protocol Dissector DoS in Wireshark

Publication date: 2026-08-19

Last updated on: 2026-08-28

Assigner: GitLab Inc.

Description

C12.22 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

2026-08-28

Generated

2026-09-09

AI Q&A

2026-08-20

EPSS Evaluated

2026-09-07

NVD

CVE-2026-76886

EUVD

EUVD-2026-63142

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-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This vulnerability involves a crash in the C12.22 protocol dissector affecting versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18. The crash can lead to a denial of service, disrupting normal operations.

Detection Guidance

This vulnerability is related to a C12.22 protocol dissector crash in Wireshark versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18. To detect it, monitor for crashes when processing C12.22 protocol traffic. Use Wireshark's command-line tool tshark to capture and analyze packets for malformed C12.22 protocol data.

Impact Analysis

The vulnerability allows attackers to cause a denial of service, potentially leading to system crashes or unresponsiveness. This could disrupt services relying on the affected protocol versions.

Compliance Impact

This vulnerability causes a denial of service via a protocol dissector crash, which could disrupt services handling sensitive data. While not directly tied to compliance standards like GDPR or HIPAA, such disruptions may impact availability requirements for regulated data processing.

Mitigation Strategies

Update affected systems to versions outside the vulnerable ranges (4.6.0 to 4.6.7 and 4.4.0 to 4.4.18) to patch the C12.22 protocol dissector crash issue.

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