CVE-2026-15165 Wireshark CVE debrief

Who should care

Network administrators and security professionals responsible for managing and securing network infrastructure should be aware of this vulnerability. Specifically, those using Wireshark versions 4.6.0 through 4.6.6 should take immediate action to mitigate the risk. This includes reviewing and updating system configurations, monitoring network traffic, and implementing additional security controls as needed.

Technical summary

The vulnerability is caused by a TLS ECH decryptor crash in Wireshark, which can be exploited to launch a denial-of-service (DoS) attack. The Common Vulnerabilities and Exposures (CVE) score for this vulnerability is 5.5, indicating a medium severity level. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. Affected systems include Wireshark versions 4.6.0 through 4.6.6.

Defensive priority

Medium priority should be given to patching or mitigating this vulnerability, as it can lead to a denial-of-service attack.

Recommended defensive actions

• Update Wireshark to version 4.6.7 or later
• Implement network segmentation to limit the attack surface
• Monitor network traffic for suspicious activity
• Consider using a Web Application Firewall (WAF) to detect and prevent attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-08T21:16:47.450Z and was last modified on 2026-07-10T13:51:09.720Z. The NVD entry is currently Analyzed. Evidence is limited to public sources and may not reflect the full scope or impact of this vulnerability. Defenders should verify affected systems and review official advisories for specific guidance.

Official resources