CVE-2026-76879: CWE-121: Stack-based Buffer Overflow in Wireshark Foundation Wireshark
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 v3.1
Score 7.5high
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-2026-76879 is a stack-based buffer overflow vulnerability in the C12.22 protocol dissector component of Wireshark. It affects versions 4.4.0 up to and including 4.4.18, and 4.6.0 up to and including 4.6.7. The flaw allows crafted packets to cause the Wireshark application to crash, leading to denial of service. The vulnerability does not impact confidentiality or integrity but affects availability. No known exploits are reported in the wild. The vulnerability is publicly disclosed with a CVSS score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Potential Impact
Successful exploitation results in denial of service by crashing the Wireshark application when processing malicious C12.22 protocol packets. There is no reported impact on confidentiality or integrity.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the Wireshark Foundation vendor advisory for current remediation guidance. Until a fix is available, avoid analyzing untrusted C12.22 protocol traffic or use alternative tools.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitLab
- Date Reserved
- 2026-08-19T22:34:00.090Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8633c5acd9273b49b8ad00
Added to database: 08/19/2026, 22:52:53 UTC
Last enriched: 09/18/2026, 23:34:06 UTC
Last updated: 10/04/2026, 10:02:29 UTC
Views: 80
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