CVE-2026-76918: CWE-122: Heap-based Buffer Overflow in Wireshark Foundation Wireshark
A heap-based buffer overflow vulnerability exists in the SSH protocol dissector of Wireshark versions 4.4.0 and 4.6.0, including some patch releases. This flaw can cause the application to crash, resulting in a denial of service condition. The vulnerability affects specific versions and has a medium severity rating with a CVSS score of 5.5.
AI Analysis
Technical Summary
CVE-2026-76918 is a heap-based buffer overflow vulnerability in the SSH protocol dissector component of Wireshark Foundation's Wireshark software. It affects versions 4.4.0 through 4.4.18 and 4.6.0 through 4.6.7. The flaw allows crafted SSH packets to cause a crash, leading to denial of service. The CVSS 3.1 base score is 5.5, indicating medium severity, with an attack vector requiring local access, low complexity, no privileges required, and user interaction needed. There is no confidentiality or integrity impact, only availability is affected. No official patch or remediation level has been published yet.
Potential Impact
The vulnerability causes a denial of service by crashing Wireshark when processing malicious SSH protocol data. There is no impact on confidentiality or integrity. Exploitation requires local access and user interaction. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid opening untrusted SSH traffic captures in affected versions of Wireshark. Monitor official Wireshark Foundation advisories for updates and patches.
CVE-2026-76918: CWE-122: Heap-based Buffer Overflow in Wireshark Foundation Wireshark
Description
A heap-based buffer overflow vulnerability exists in the SSH protocol dissector of Wireshark versions 4.4.0 and 4.6.0, including some patch releases. This flaw can cause the application to crash, resulting in a denial of service condition. The vulnerability affects specific versions and has a medium severity rating with a CVSS score of 5.5.
CVSS v3.1
Score 5.5medium
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-2026-76918 is a heap-based buffer overflow vulnerability in the SSH protocol dissector component of Wireshark Foundation's Wireshark software. It affects versions 4.4.0 through 4.4.18 and 4.6.0 through 4.6.7. The flaw allows crafted SSH packets to cause a crash, leading to denial of service. The CVSS 3.1 base score is 5.5, indicating medium severity, with an attack vector requiring local access, low complexity, no privileges required, and user interaction needed. There is no confidentiality or integrity impact, only availability is affected. No official patch or remediation level has been published yet.
Potential Impact
The vulnerability causes a denial of service by crashing Wireshark when processing malicious SSH protocol data. There is no impact on confidentiality or integrity. Exploitation requires local access and user interaction. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid opening untrusted SSH traffic captures in affected versions of Wireshark. Monitor official Wireshark Foundation advisories for updates and patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitLab
- Date Reserved
- 2026-08-19T22:44:15.542Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8633c5acd9273b49b8ad0d
Added to database: 08/19/2026, 22:52:53 UTC
Last enriched: 08/19/2026, 23:09:40 UTC
Last updated: 08/20/2026, 00:06:20 UTC
Views: 3
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