CVE-2026-78403

Unauthenticated Stack Buffer Overflow in Sentinel Keys Server

Published Oct 30, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Upgrade to latest version.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Unauthenticated Stack Buffer Overflow in Sentinel Keys Server
First Time appeared Thalesgroup
Thalesgroup sentinel Keys Server
Weaknesses CWE-121
CWE-862
CPEs cpe:2.3:a:thalesgroup:sentinel_keys_server:*:*:windows:*:*:*:*:*
Vendors & Products Thalesgroup
Thalesgroup sentinel Keys Server
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
THA-PSIRT
Published
Updated
Oct 30, 2026, 8:02 PM
Reserved
Aug 24, 2026, 2:22 PM
Status
Awaiting Analysis
Published
Oct 30, 2026, 8:17 PM
Modified
Nov 2, 2026, 7:14 PM