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PatchSiren cyber security CVE debrief

CVE-2026-15165 Wireshark CVE debrief

CVE-2026-15165 is a vulnerability in Wireshark, a popular network protocol analyzer, that can cause a denial-of-service (DoS) attack. The issue arises from a TLS ECH decryptor crash in Wireshark versions 4.6.0 through 4.6.6. This vulnerability has been assigned a CVSS score of 5.5, indicating a medium severity level. Network administrators and security professionals should be aware of the potential impact on network infrastructure and take steps to mitigate the risk.

Vendor
Wireshark
Product
Wireshark
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-08
Original CVE updated
2026-07-10
Advisory published
2026-07-08
Advisory updated
2026-07-10

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-15165 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-15165

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-15165 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-15165

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.