CVE-2026-78403

CRITICAL CVSS 4.0: 9.3 EPSS 0.58%
Updated Oct 30, 2026
Stack-based
Parameter Value
CVSS 9.3 (CRITICAL)
Type CWE-121 (Stack-based Buffer Overflow), CWE-862 (Missing Authorization)
Vendor Stack-based
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0