SB2026081232 - Multiple vulnerabilities in Microsoft Windows DNS Server

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Main Vulnerability Database SB2026081232

SB2026081232 - Multiple vulnerabilities in Microsoft Windows DNS Server

Published: August 12, 2026

Security Bulletin ID SB2026081232
CSH Severity
High
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Medium 33% Low 17%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 vulnerabilities.


1) Race condition (CVE-ID: CVE-2026-62820)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to a race condition in Windows DNS Server. A remote attacker can exploit the race and execute arbitrary code on the target system.


2) Race condition (CVE-ID: CVE-2026-61920)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to execute arbitrary code on the system.

The vulnerability exists due to a race condition in Windows DNS Server. A remote administrator can exploit the race and execute arbitrary code on the target system.


3) Use-after-free (CVE-ID: CVE-2026-65789)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows DNS Server. A remote attacker can execute arbitrary code on the target system.


4) Out-of-bounds write (CVE-ID: CVE-2026-62817)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in Windows DNS Server. A remote attacker on the local network can trigger an out-of-bounds write and execute arbitrary code on the target system.


5) Use-after-free (CVE-ID: CVE-2026-62787)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows DNS Server. A remote user can win a race condition and execute arbitrary code on the target system.


6) Stack-based buffer overflow (CVE-ID: CVE-2026-62878)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Windows DNS Server. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Remediation

Install update from vendor's website.

References