Description
Heap-based buffer overflow in Windows DNS allows an authorized attacker to elevate privileges locally.
Published: 2026-07-14
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The flaw is a heap‑based buffer overflow in the Windows DNS client. An authorized victim can trigger the overflow to corrupt memory, allowing the execution of arbitrary code with elevated local privileges. The weakness is categorized as CWE‑122.

Affected Systems

The vulnerability affects Microsoft Windows 10 versions 21H2 and 22H2, Windows 11 versions 24H2, 25H2, and 26H1, as well as Windows Server 2022 and Windows Server 2025, including Server Core installations.

Risk and Exploitability

With a CVSS score of 7.8 the vulnerability is considered high severity. The EPSS score of less than 1 % indicates a very low probability of active exploitation, and it is not listed in the CISA KEV catalog. The likely attack vector is local: an attacker with user privileges who can run code on the affected system must trigger the overflow, so the risk is confined to local users rather than remote actors.

Generated by OpenCVE AI on July 31, 2026 at 09:41 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Download and install the Microsoft security update that addresses CVE‑2026‑49175 from the Microsoft Security Advisory.
  • Restart the affected systems to complete the installation of the update.
  • Apply the principle of least privilege by removing unnecessary user permissions and restricting local user access to reduce the chance of an authorized attacker exploiting the flaw.

Generated by OpenCVE AI on July 31, 2026 at 09:41 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 15 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 14 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Description Heap-based buffer overflow in Windows DNS allows an authorized attacker to elevate privileges locally.
Title Windows DNS Client Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-122
CPEs cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Subscriptions

Microsoft Windows 10 21h2 Windows 10 22h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2022 Windows Server 2025
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-08-03T22:52:59.282Z

Reserved: 2026-05-27T23:44:09.623Z

Link: CVE-2026-49175

cve-icon Vulnrichment

Updated: 2026-07-15T15:48:29.245Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T09:45:04Z

Weaknesses
  • CWE-122

    Heap-based Buffer Overflow