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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.

Official resources

CVE-2026-42981 was published on 2026-06-09T17:17:14.063Z and modified on 2026-06-11T16:55:17.263Z.