CVE-2026-78402

Stack Buffer Overflow in Sentinel Keys Server

Published Oct 30, 2026 CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Description
Stack-based buffer overflow and out-of-bounds
write 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 input message. A local attacker may craft an input and send it to Sentinel
Keys Server. It may lead to code execution as NT AUTHORITY\SYSTEM enabling
local privilege escalation.





This issue affects Sentinel Keys Server: versions
lower than 1.3.8.0.

Remediation

Vendor Solution

Upgrade latest version.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Stack-based buffer overflow and out-of-bounds write 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 input message. A local attacker may craft an input and send it to Sentinel Keys Server. It may lead to code execution as NT AUTHORITY\SYSTEM enabling local privilege escalation. This issue affects Sentinel Keys Server: versions lower than 1.3.8.0.
Title Stack Buffer Overflow in Sentinel Keys Server
First Time appeared Thalesgroup
Thalesgroup sentinel Keys Server
Weaknesses CWE-121
CWE-787
CPEs cpe:2.3:a:thalesgroup:sentinel_keys_server:*:*:windows:*:*:*:*:*
Vendors & Products Thalesgroup
Thalesgroup sentinel Keys Server
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/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, 8:00 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