---
id: CVE-2026-78402
title: Stack Buffer Overflow in Sentinel Keys Server
summary: "Stack-based buffer overflow and out-of-bounds\nwrite vulnerability in Thales Sentinel Keys Server on Windows allows Overflow\nBuffers.\_\n\n\n\nSentinel Keys Server does not check the length of the first field in\nthe input message. A local atta…"
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-121
  - CWE-787
vendor: Thalesgroup
product: Sentinel Keys Server
affected:
  - sentinel_keys_server < 1.3.8.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-30T20:00:33.506955Z'
published: '2026-10-30'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T20:00:42.731Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-78402'
references:
  - url: >-
      https://supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb_id=50fc9f3b3b005f10bba8b41864e45a61&sysparm_article=KB0031216
tags:
  - cve.org
epss: 0.00147
epssPercentile: 0.03968
ingestedAt: '2026-11-05T16:24:31.435Z'
---

## Overview

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.

## Affected

- `sentinel_keys_server < 1.3.8.0`

## Remediation

Upgrade latest version.