CVE-2026-88129

Role: DNS Server Denial of Service Vulnerability

CVE-2026-88129 is fixed in 12 products on 1 platform, first by KB5126868, released October 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0123

69th percentile

<p>Out-of-bounds read in DNS Server allows an authorized attacker to deny service over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2012		KB5126835	Oct 13, 2026
Windows Server 2012 (Server Core installation)		KB5126835	Oct 13, 2026
Windows Server 2012 R2		KB5126836	Oct 13, 2026
Windows Server 2012 R2 (Server Core installation)		KB5126836	Oct 13, 2026
Windows Server 2016	14393.9612	KB5126868	Oct 13, 2026
Windows Server 2016 (Server Core installation)	14393.9612	KB5126868	Oct 13, 2026
Windows Server 2019	17763.9376	KB5126651	Oct 13, 2026
Windows Server 2019 (Server Core installation)	17763.9376	KB5126651	Oct 13, 2026
Windows Server 2022	20348.5761	KB5126655	Oct 13, 2026
Windows Server 2022 (Server Core installation)	20348.5761	KB5126655	Oct 13, 2026
Windows Server 2025	26100.33650	KB5126646	Oct 13, 2026
Windows Server 2025 (Server Core installation)	26100.33650	KB5126646	Oct 13, 2026

Details

Published
October 13, 2026
Weakness
Out-of-bounds Read
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88129

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