CVE-2026-78403

CRITICAL 9.8

Unauthenticated Stack Buffer Overflow in Sentinel Keys Server

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-121 CWE-862
Vendor	thalesgroup
Product	sentinel keys server
Published	Oct 30, 2026
Last Updated	Oct 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Thalesgroup / Sentinel Keys Server

0 < 1.3.8.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Matt Hetelson ([email protected])