CVE-2026-42972: Windows Hyper-V Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-42972

Exposure of sensitive information to an unauthorized actor in Windows Hyper-V allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoft product: Windows Hyper-V Information disclosure

What: Sensitive information can be disclosed to unauthorized actors.
Who is affected: Users of Windows Hyper-V.
Urgency: Remediation is necessary due to the medium severity rating.
Action: Apply the security update to address the information disclosure.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42972

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-429720.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-42972	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Microsoft Windows: Multiple vulnerabilitiescert-bund

Recent advisories for Windows Hyper-V Information

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-61368: Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to disclose inform…nvd · 2026-08-11
mediumCVE-2026-61368: Windows Hyper-V Information Disclosure Vulnerabilitymsrc · 2026-08-11