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PatchSiren cyber security CVE debrief

CVE-2026-42981 Microsoft CVE debrief

CVE-2026-42981 is a HIGH severity vulnerability in Windows Performance Monitor that allows an unauthorized attacker to execute code over a network. The vulnerability is caused by an integer underflow (wrap or wraparound) and has a CVSS score of 8.1.

Vendor
Microsoft
Product
Windows 11 version 23H2
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-11
Advisory published
2026-06-09
Advisory updated
2026-06-11

Who should care

Administrators and users of Windows Performance Monitor should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by an integer underflow (wrap or wraparound) in Windows Performance Monitor. This allows an unauthorized attacker to execute code over a network.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible.
  • Refer to resourceLinkAnnotations for more information.

Evidence notes

The vulnerability is analyzed and has a CVSS vector of CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42981 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42981

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

  • CVE-2026-42981 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42981

    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.