CVE-2026-42904

CriticalCVSS 9.6

Published: 09/06/2026(UTC)Updated: 23/07/2026(UTC)Translated: 24/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.44%

36th percentile - higher than 36% of all known CVEs

Summary

Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.

Risk Assessment

An attacker could gain elevated privileges on the local network, potentially leading to compromise of sensitive systems.

Recommendation

Install the latest Windows security updates from Microsoft.

Other vulnerabilities in Windows TCP/IP

See all

CVE-2026-40415High
A use after free vulnerability in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
CVE-2026-40406High
A use after free vulnerability in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.
CVE-2026-40405High
A null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.
CVE-2026-34351High
A race condition in Windows TCP/IP allows for concurrent execution using shared resources with improper synchronization. This enables an authorized attacker to elevate privileges locally.
CVE-2026-34334High
A race condition in Windows TCP/IP allows for concurrent execution using shared resources with improper synchronization. This enables an authorized attacker to elevate privileges locally.
CVE-2026-33837High
Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
CVE-2021-26424Critical
Remote code execution vulnerability in Windows TCP/IP stack. It could allow an attacker to execute arbitrary code in the context of the kernel.
CVE-2026-96852High
A use after free vulnerability in the Windows TCP/IP stack allows an authorized attacker to elevate privileges locally. The issue stems from accessing freed memory within the TCP/IP protocol handling code.
CVE-2026-85834High
Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
CVE-2026-85368High
Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

Original NVD description (English source)

Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS