CVE-2026-76879: CWE-121: Stack-based Buffer Overflow in Wireshark Foundation Wireshark
A stack-based buffer overflow vulnerability exists in the C12.22 protocol dissector of Wireshark versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18. This flaw can cause the application to crash, resulting in a denial of service condition. The vulnerability is identified as CWE-121 and has a CVSS 3.1 score of 7.5, indicating high severity.
AI Analysis
Technical Summary
CVE-2026-76879 is a stack-based buffer overflow vulnerability in the C12.22 protocol dissector component of Wireshark Foundation's Wireshark software. It affects versions 4.6.0 through 4.6.7 and 4.4.0 through 4.4.18. The flaw allows crafted packets to cause the application to crash, leading to denial of service. The vulnerability does not impact confidentiality or integrity but affects availability. No official patch or remediation level has been published at this time, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation causes a denial of service by crashing the Wireshark application when processing malicious C12.22 protocol packets. There is no impact on confidentiality or integrity according to the CVSS vector. This may disrupt network traffic analysis or monitoring activities relying on Wireshark.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid analyzing untrusted C12.22 protocol traffic with affected Wireshark versions to reduce risk of denial of service.
CVE-2026-76879: CWE-121: Stack-based Buffer Overflow in Wireshark Foundation Wireshark
Description
A stack-based buffer overflow vulnerability exists in the C12.22 protocol dissector of Wireshark versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18. This flaw can cause the application to crash, resulting in a denial of service condition. The vulnerability is identified as CWE-121 and has a CVSS 3.1 score of 7.5, indicating high severity.
CVSS v3.1
Score 7.5high
Affected software
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-2026-76879 is a stack-based buffer overflow vulnerability in the C12.22 protocol dissector component of Wireshark Foundation's Wireshark software. It affects versions 4.6.0 through 4.6.7 and 4.4.0 through 4.4.18. The flaw allows crafted packets to cause the application to crash, leading to denial of service. The vulnerability does not impact confidentiality or integrity but affects availability. No official patch or remediation level has been published at this time, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation causes a denial of service by crashing the Wireshark application when processing malicious C12.22 protocol packets. There is no impact on confidentiality or integrity according to the CVSS vector. This may disrupt network traffic analysis or monitoring activities relying on Wireshark.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid analyzing untrusted C12.22 protocol traffic with affected Wireshark versions to reduce risk of denial of service.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitLab
- Date Reserved
- 2026-08-19T22:34:00.090Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8633c5acd9273b49b8ad00
Added to database: 08/19/2026, 22:52:53 UTC
Last enriched: 08/19/2026, 23:07:14 UTC
Last updated: 08/20/2026, 02:38:07 UTC
Views: 6
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