CVE-2026-76879

Analyzed Analyzed - Analysis Complete

C12.22 Protocol Dissector DoS in Wireshark

Publication date: 2026-08-19

Last updated on: 2026-09-01

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

2026-09-01

Generated

2026-09-09

AI Q&A

2026-08-20

EPSS Evaluated

2026-09-07

NVD

CVE-2026-76879

EUVD

EUVD-2026-63177

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-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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 condition, disrupting normal operations.

Detection Guidance

This vulnerability is related to a C12.22 protocol dissector crash in specific Wireshark versions. To detect it, monitor for crashes when processing C12.22 traffic. Use Wireshark's tshark command to capture and analyze C12.22 protocol traffic for malformed packets that may trigger the crash.

Impact Analysis

The vulnerability allows attackers to cause a denial of service by exploiting the protocol dissector crash. This could result in system downtime, service unavailability, or disruptions to network operations.

Compliance Impact

This vulnerability causes a denial of service due to a protocol dissector crash, which could disrupt services handling sensitive data. While not directly tied to GDPR or HIPAA, such disruptions may impact availability requirements for regulated systems, potentially leading to compliance issues if service interruptions affect data processing or access.

Mitigation Strategies

Update affected systems to versions outside the vulnerable range (4.6.0 to 4.6.7 and 4.4.0 to 4.4.18). Disable C12.22 protocol dissector if not required. Monitor network traffic for unusual patterns indicating exploitation attempts.

Hi! I’m here to help you understand CVE-2026-76879. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70