CVE-2026-78402

High

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.

SeverityHigh

CVSS7.8

Exploit probability—

ProductSentinel Keys Server

PublishedOct 30, 2026

First seenNov 4, 2026

Weakness typeCWE-121CWE-121 CWE-787Out-of-bounds write

How to fix

Update

Thalesgroup Sentinel Keys Server1.3.8.0 or later

Vendor advisories

supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb_id=50fc9f3b3b005f10bba8b41864e45a61&sysparm_article=KB0031216

Affected products

Product	Affected versions	Fixed in
Thalesgroup Sentinel Keys Server	v < 1.3.8.0	1.3.8.0

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.