CVE-2026-62688

Local privilege escalation via heap buffer overflow

Published Aug 11, 2026 · Updated Aug 25, 2026

Heap-based buffer overflow in Microsoft's Windows MIDI Service Module allows local users to elevate privileges on affected Windows 11 builds. Microsoft identifies a heap-based overflow in the module but has not disclosed the responsible function, malformed input, or out-of-bounds write operation. Exploitation requires local authenticated access and no separate user interaction; Microsoft does not state the resulting privilege level.

CVSS severity7.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Microsoft's Windows MIDI Service Module allows local users to elevate privileges on affected Windows 11 builds. Microsoft identifies a heap-based overflow in the module but has not disclosed the responsible function, malformed input, or out-of-bounds write operation. Exploitation requires local authenticated access and no separate user interaction; Microsoft does not state the resulting privilege level.

The record

CVE
CVE-2026-62688
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Microsoft
Product
Windows 11, version 25H2
Classifications
CWE-122, T1068
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=10.0.26200.0 <10.0.26200.9168

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

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

Published CVSS scores

7.8MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

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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