SB2026081208 - Multiple vulnerabilities in Microsoft Windows Event Logging Service

Description

This security bulletin contains information about 3 vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2026-61347)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in Windows Event Logging Service. A local user can trigger an out-of-bounds read error and read contents of memory on the system.

2) Use of uninitialized resource (CVE-ID: CVE-2026-59137)

CWE-ID: CWE-908 - Use of Uninitialized Resource

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to bypass certain security restrictions.

The vulnerability exists due to usage of uninitialized resources in Windows Event Logging Service. A local user can pass specially crafted data to the application, trigger uninitialized usage of resources and gain access to sensitive information on the system.

3) Race condition (CVE-ID: CVE-2026-59126)

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

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/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 system.

The vulnerability exists due to a race condition in Windows Event Logging Service. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61347
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59137
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59126