CVE-2026-78403

CriticalCVSS 9.8

Published: 30/10/2026(UTC)Translated: 30/10/2026(UTC)NVD NIST

Summary

Stack-based buffer overflow and missing authorization in Thales Sentinel Keys Server on Windows. The server does not check the length of the first field in an HTTP request, allowing an attacker to send a crafted request and potentially achieve remote code execution as NT AUTHORITY\SYSTEM.

Risk Assessment

A remote attacker can execute arbitrary code with highest system privileges, taking over the server and key infrastructure.

Recommendation

Update Sentinel Keys Server to version 1.3.8.0 or later and restrict network access to the service.

Other vulnerabilities in Thales Sentinel Keys Server

CVE-2026-78402High
Stack-based buffer overflow and out-of-bounds write in Thales Sentinel Keys Server on Windows. The server does not check the length of the first field in the input message, allowing a local attacker to execute code as NT AUTHORITY\SYSTEM and escalate privileges.

Original NVD description (English source)

Stack-based buffer overflow and missing authorization vulnerability in Thales Sentinel Keys Server on Windows allows Overflow Buffers. Sentinel Keys Server does not check the length of the first field in the HTTP request. An attacker may craft an HTTP request and send it to Sentinel Keys Server. It may lead to remote code execution as NT AUTHORITY\SYSTEM. This issue affects Sentinel Keys Server: versions lower than 1.3.8.0.

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