CVE tracker / CVE-2026-69497
CVE-2026-69497
CVE-2026-69497 is the Windows DHCP Server Denial of Service Vulnerability. Microsoft rates it Important, CVSS 6.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.
Risk summary
Microsoft describes it: “Missing release of memory after effective lifetime in Windows DHCP Server allows an authorized attacker to deny service over a network.”
How to fix it
Microsoft lists 16 affected products and the update that fixes each:
- KB5122871 · fixed build 10.0.26100.33438
Windows Server 2025, Windows Server 2025 (Server Core installation) - KB5122876 · fixed build 10.0.17763.9245
Windows Server 2019 (Server Core installation), Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows 10 Version 1809 for 32-bit Systems - KB5122882 · fixed build 10.0.20348.5622
Windows Server 2022 (Server Core installation), Windows Server 2022 - KB5123065 · fixed build 6.2.9200.26349
Windows Server 2012, Windows Server 2012 (Server Core installation) - KB5123066 · fixed build 6.3.9600.23398
Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) - KB5123099 · fixed build 10.0.14393.9512
Windows Server 2016 (Server Core installation), Windows 10 Version 1607 for x64-based Systems, Windows Server 2016, Windows 10 Version 1607 for 32-bit Systems
What Microsoft changed
- September 8, 2026: Information published.
Details
- Weakness
- CWE-401: Missing Release of Memory after Effective Lifetime
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- September 8, 2026
- Last revised
- September 8, 2026
Get told when this changes
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References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.