SB2026081209 - Multiple vulnerabilities in Microsoft Windows DHCP Client

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Main Vulnerability Database SB2026081209

SB2026081209 - Multiple vulnerabilities in Microsoft Windows DHCP Client

Published: August 12, 2026

Security Bulletin ID SB2026081209
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2026-61361)

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 DHCP Client. A remote user can execute arbitrary code on the target system.


2) Heap-based buffer overflow (CVE-ID: CVE-2026-62736)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to escalate privileges on the target system.

The vulnerability exists due to a boundary error in Windows DHCP Client. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the system.


3) Resource exhaustion (CVE-ID: CVE-2026-65785)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources in Windows DHCP Client. A remote attacker on the local network can trigger resource exhaustion and perform a denial of service (DoS) attack.


4) Stack-based buffer overflow (CVE-ID: CVE-2026-62755)

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

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to escalate privileges on the target system.

The vulnerability exists due to a boundary error in Windows DHCP Client. A local user can trigger stack-based buffer overflow and gain elevated privileges on the system.


Remediation

Install update from vendor's website.

References