CVE-2026-76886: CWE-122: Heap-based Buffer Overflow in Wireshark Foundation Wireshark
CVE-2026-76886 is a heap-based buffer overflow vulnerability in the C12.22 protocol dissector of Wireshark versions 4.4.0 through 4.4.18 and 4.6.0 through 4.6.7. This flaw can cause the application to crash, resulting in a denial of service condition.
AI Analysis
Technical Summary
This vulnerability involves a heap-based buffer overflow in the C12.22 protocol dissector component of Wireshark Foundation's Wireshark software. It affects versions from 4.4.0 up to and including 4.4.18, and from 4.6.0 up to and including 4.6.7. The flaw allows crafted input to cause the dissector to crash, leading to denial of service. The CVSS 3.1 score is 8.1, indicating high severity, with network attack vector, high attack complexity, no privileges or user interaction required, and impacts confidentiality, integrity, and availability.
Potential Impact
Successful exploitation results in denial of service by crashing the Wireshark application when processing malicious C12.22 protocol data. The vulnerability impacts confidentiality, integrity, and availability as per the CVSS vector, but no known exploits are reported in the wild.
Mitigation Recommendations
No explicit patch or remediation information is provided in the input data. Patch status is not yet confirmed — check the Wireshark Foundation vendor advisory for current remediation guidance. Users should avoid processing untrusted C12.22 protocol traffic with affected versions until a fix is confirmed.
CVE-2026-76886: CWE-122: Heap-based Buffer Overflow in Wireshark Foundation Wireshark
Description
CVE-2026-76886 is a heap-based buffer overflow vulnerability in the C12.22 protocol dissector of Wireshark versions 4.4.0 through 4.4.18 and 4.6.0 through 4.6.7. This flaw can cause the application to crash, resulting in a denial of service condition.
CVSS v3.1
Score 8.1high
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
This vulnerability involves a heap-based buffer overflow in the C12.22 protocol dissector component of Wireshark Foundation's Wireshark software. It affects versions from 4.4.0 up to and including 4.4.18, and from 4.6.0 up to and including 4.6.7. The flaw allows crafted input to cause the dissector to crash, leading to denial of service. The CVSS 3.1 score is 8.1, indicating high severity, with network attack vector, high attack complexity, no privileges or user interaction required, and impacts confidentiality, integrity, and availability.
Potential Impact
Successful exploitation results in denial of service by crashing the Wireshark application when processing malicious C12.22 protocol data. The vulnerability impacts confidentiality, integrity, and availability as per the CVSS vector, but no known exploits are reported in the wild.
Mitigation Recommendations
No explicit patch or remediation information is provided in the input data. Patch status is not yet confirmed — check the Wireshark Foundation vendor advisory for current remediation guidance. Users should avoid processing untrusted C12.22 protocol traffic with affected versions until a fix is confirmed.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitLab
- Date Reserved
- 2026-08-19T22:34:34.934Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8633c7acd9273b49b8ad4a
Added to database: 08/19/2026, 22:52:55 UTC
Last enriched: 09/11/2026, 02:47:21 UTC
Last updated: 10/02/2026, 14:46:10 UTC
Views: 79
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