CRITICAL Published October 13, 2026

CVE-2026-83578

Integer underflow (wrap or wraparound) in Windows PowerShell allows an unauthorized attacker to execute code over a network.

CVSS base score

9.8 (v3.1)

Severity

CRITICAL

Attack vector

Network

Weakness

CWE-122, CWE-190, CWE-191

Last modified

October 29, 2026

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

microsoft windows 10 1607 microsoft windows 10 1809 microsoft windows 10 21h2 microsoft windows 10 22h2 microsoft windows 11 23h2 microsoft windows 11 24h2 microsoft windows 11 25h2 microsoft windows 11 26h1 microsoft windows 11 26h2 microsoft windows server 2012

References

msrc.microsoft.com Vendor Advisory, Patch

View full NVD advisory →

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CVE-2026-83578

Affected products

References

More microsoft vulnerabilities

Published the same day

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