CVE-2026-76919: CWE-457: Use of Uninitialized Variable in Wireshark Foundation Wireshark
CVE-2026-76919 is a medium severity vulnerability in Wireshark affecting versions 4.4.0 and 4.6.0. It involves a use of uninitialized variable in the ESS protocol dissector, which can cause the application to crash and result in a denial of service condition.
AI Analysis
Technical Summary
This vulnerability (CWE-457) in Wireshark's ESS protocol dissector affects versions 4.4.0 and 4.6.0. The flaw is due to the use of an uninitialized variable, which can lead to a crash when processing certain network packets. This crash results in a denial of service, disrupting normal operation of the Wireshark application. The CVSS 3.1 base score is 5.3, reflecting a network attack vector with low complexity and no privileges or user interaction required, impacting availability only.
Potential Impact
An attacker can cause Wireshark to crash remotely by sending specially crafted ESS protocol packets, leading to denial of service. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor Wireshark Foundation advisories for updates addressing this issue.
CVE-2026-76919: CWE-457: Use of Uninitialized Variable in Wireshark Foundation Wireshark
Description
CVE-2026-76919 is a medium severity vulnerability in Wireshark affecting versions 4.4.0 and 4.6.0. It involves a use of uninitialized variable in the ESS protocol dissector, which can cause the application to crash and result in a denial of service condition.
CVSS v3.1
Score 5.3medium
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
This vulnerability (CWE-457) in Wireshark's ESS protocol dissector affects versions 4.4.0 and 4.6.0. The flaw is due to the use of an uninitialized variable, which can lead to a crash when processing certain network packets. This crash results in a denial of service, disrupting normal operation of the Wireshark application. The CVSS 3.1 base score is 5.3, reflecting a network attack vector with low complexity and no privileges or user interaction required, impacting availability only.
Potential Impact
An attacker can cause Wireshark to crash remotely by sending specially crafted ESS protocol packets, leading to denial of service. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor Wireshark Foundation advisories for updates addressing this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitLab
- Date Reserved
- 2026-08-19T22:44:20.536Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8633c5acd9273b49b8ad10
Added to database: 08/19/2026, 22:52:53 UTC
Last enriched: 08/19/2026, 23:09:35 UTC
Last updated: 08/20/2026, 00:06:21 UTC
Views: 4
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