CVE-2026-62699

Physical code execution via UDFS heap overflow

Published Aug 11, 2026 · Updated Aug 25, 2026

Remote code execution in Microsoft Windows UDFS in supported releases before the August 2026 fixes allows attackers to run code via crafted physical media. Microsoft has disclosed only that the Universal Disk Format File System Driver contains a heap-based overflow and also mapped the bug to integer overflow or wraparound, without identifying the UDF parsing routine or malformed field that corrupts heap memory. Exploitation requires physical access to present a malicious UDF-formatted disk or image to a target system, and successful parsing can yield kernel-context code execution rather than mere file disclosure.

CVSS severity6.8
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Remote code execution in Microsoft Windows UDFS in supported releases before the August 2026 fixes allows attackers to run code via crafted physical media. Microsoft has disclosed only that the Universal Disk Format File System Driver contains a heap-based overflow and also mapped the bug to integer overflow or wraparound, without identifying the UDF parsing routine or malformed field that corrupts heap memory. Exploitation requires physical access to present a malicious UDF-formatted disk or image to a target system, and successful parsing can yield kernel-context code execution rather than mere file disclosure.

The record

CVE
CVE-2026-62699
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, CWE-122
Attack vector
physical
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8Microsoft CorporationCVSS:3.1/AV:P/AC:L/PR:N/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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-122Heap-based Buffer Overflow

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo