CVE-2026-62798

Local kernel-memory disclosure via untrusted pointer dereference

Published Aug 11, 2026 · Updated Aug 25, 2026

Untrusted pointer dereference in Microsoft Windows Win32K allows local users to disclose information from kernel memory. Win32K dereferences a pointer that is not established as trusted, but Microsoft has not published the affected function or input path. Exploitation requires local low-privilege access and has no reported integrity or availability impact.

CVSS severity5.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Untrusted pointer dereference in Microsoft Windows Win32K allows local users to disclose information from kernel memory. Win32K dereferences a pointer that is not established as trusted, but Microsoft has not published the affected function or input path. Exploitation requires local low-privilege access and has no reported integrity or availability impact.

The record

CVE
CVE-2026-62798
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Microsoft
Product
Windows Server 2025 (Server Core installation)
Classifications
CWE-822
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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 <10.0.26100.33296

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33296
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.9168
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.9168
Microsoft · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.2704
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.7517
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.33296

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-822Untrusted Pointer Dereference

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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