CVE-2026-45638

HighCVSS 7.8

Published: 09/06/2026(UTC)Updated: 23/07/2026(UTC)Translated: 25/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.29%

21th percentile - higher than 21% of all known CVEs

Summary

Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Risk Assessment

An authorized user can gain higher privileges, potentially leading to full system compromise.

Recommendation

Install the latest Windows security updates that include a fix for this vulnerability.

Other vulnerabilities in Windows Ancillary Function Driver for WinSock

See all

CVE-2026-34344High
The Windows Ancillary Function Driver for WinSock has a vulnerability related to resource access using an incompatible type ('type confusion'), allowing an authorized attacker to elevate privileges locally.
CVE-2026-20810High
A vulnerability in the Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally. The issue involves freeing memory not on the heap.
CVE-2026-68820HighActively exploited
Use-after-free in Windows Ancillary Function Driver for WinSock. An authorized attacker can elevate privileges locally.
CVE-2026-20860High
A type confusion vulnerability in the Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-70307High
A use-after-free vulnerability in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-61348High
A use-after-free vulnerability in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-57093High
A use-after-free vulnerability in the Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-50462High
The Windows Ancillary Function Driver for WinSock has an external control of file name or path vulnerability, allowing an authorized attacker to elevate privileges locally.
CVE-2026-50312Medium
Use-after-free vulnerability in the Windows Ancillary Function Driver for WinSock. Allows an authorized attacker to elevate privileges locally.
CVE-2026-34346Medium
Cleartext transmission of sensitive information in Windows Ancillary Function Driver for WinSock allows an authorized attacker to disclose information locally.

Original NVD description (English source)

Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.