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Vulnerabilities

Vulnerability · CVE-2026-40398

Heap-based buffer overflow in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Published May 12, 2026 · catalog updated Jun 17, 2026 · windows 10 1607

Check if you run it

No confirmed exploitation is on record for CVE-2026-40398. EPSS is 0.33%. Act only if a listed version of windows 10 1607 is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.33%
Remediation
Advisory link
Affected products
cpe microsoft/windows 10 1607 · cpe microsoft/windows 10 1809 · cpe microsoft/windows 10 21h2 · cpe microsoft/windows 10 22h2

Heap-based buffer overflow in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 10 1607version unspecified
  • cpe microsoft/windows 10 1809version unspecified
  • cpe microsoft/windows 10 21h2version unspecified
  • cpe microsoft/windows 10 22h2version unspecified

How to fix CVE-2026-40398

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40398. EPSS is 0.33%. Act only if a listed version of windows 10 1607 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-122: Heap-based Buffer Overflow. EPSS 0.33%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 12, 2026 · NIST NVD

    Detected

    Heap-based buffer overflow in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

  2. Jun 17, 2026 · NIST NVD

    Updated

    Heap-based buffer overflow in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Sources

  • CVE.orgVulnerability recordCVE-2026-40398

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40398

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40398

    Heap-based buffer overflow in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.