All vulnerabilities
CVE-2026-88122

Role: DNS Server Denial of Service Vulnerability

Microsoft Windows Server 2012Operating systems
Open in ThreatlineRecord JSON
CVSS
6.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.79%Chance of exploitation activity in the next 30 days, higher than 55% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.2.9200.26434Also 6.3.9600.23470, 10.0.14393.9612 and 3 moreCVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 6.2.9200.26434Windows Server 2012CVE List
  • 6.2.9200.26434Windows Server 2012 (Server Core installation)CVE List
  • 6.3.9600.23470Windows Server 2012 R2CVE List
  • 6.3.9600.23470Windows Server 2012 R2 (Server Core installation)CVE List
  • 10.0.14393.9612Windows Server 2016CVE List
  • 10.0.14393.9612Windows Server 2016 (Server Core installation)CVE List
Show all 11 fixed versions
  • 10.0.17763.9376Windows Server 2019CVE List
  • 10.0.17763.9376Windows Server 2019 (Server Core installation)CVE List
  • 10.0.20348.5761Windows Server 2022CVE List
  • 10.0.26100.33650Windows Server 2025CVE List
  • 10.0.26100.33650Windows Server 2025 (Server Core installation)CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

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

Text from CVE List

Affected versions 11

  • Windows Server 2012affected: 6.2.9200.0 before 6.2.9200.26434CVE List
  • Windows Server 2012 (Server Core installation)affected: 6.2.9200.0 before 6.2.9200.26434CVE List
  • Windows Server 2012 R2affected: 6.3.9600.0 before 6.3.9600.23470CVE List
  • Windows Server 2012 R2 (Server Core installation)affected: 6.3.9600.0 before 6.3.9600.23470CVE List
  • Windows Server 2016affected: 10.0.14393.0 before 10.0.14393.9612CVE List
  • Windows Server 2016 (Server Core installation)affected: 10.0.14393.0 before 10.0.14393.9612CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.9376CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.9376CVE List
  • Windows Server 2022affected: 10.0.20348.0 before 10.0.20348.5761CVE List
  • Windows Server 2025affected: 10.0.26100.0 before 10.0.26100.33650CVE List
  • Windows Server 2025 (Server Core installation)affected: 10.0.26100.0 before 10.0.26100.33650CVE List

References 1