CVE tracker / CVE-2026-69858

CVE-2026-69858

CVE-2026-69858 is the Windows DNS Server Remote Code Execution Vulnerability. Microsoft rates it Critical, CVSS 8.1. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.

Risk summary

HighRemote Code Execution
8.1
CVSS v3 base
0.7%
EPSS: chance of exploitation in 30 days
High
Severity
Critical
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.”

How to fix it

Microsoft lists 4 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-416: Use After Free
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
September 8, 2026
Last revised
September 8, 2026

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.