CVE-2026-48566Hinoki check available

Local memory disclosure via out-of-bounds read

Published Jun 9, 2026 · Updated Jun 9, 2026

An out-of-bounds read in Microsoft Windows DWM Core Library allows local users with an account to disclose memory contents. Microsoft has not disclosed the affected routine, the input that reaches it, or how the library reads past the intended memory boundary. Exploitation requires low-privileged local access and no user interaction; the published impact is limited to confidentiality.

CVSS severity5.5
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

An out-of-bounds read in Microsoft Windows DWM Core Library allows local users with an account to disclose memory contents. Microsoft has not disclosed the affected routine, the input that reaches it, or how the library reads past the intended memory boundary. Exploitation requires low-privileged local access and no user interaction; the published impact is limited to confidentiality.

The record

CVE
CVE-2026-48566
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Microsoft
Product
Windows Server 2025 (Server Core installation)
Classifications
CWE-125, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.26100.0 <10.0.26100.32860

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.32860
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.8457
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.8457
Microsoft · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.2113
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.32860

Published CVSS scores

5.5Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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