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CVE-2026-78403— Unauthenticated Stack Buffer Overflow in Sentinel Keys Server

Quick assessment

Affected
Thalesgroup Sentinel Keys Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Thales Sentinel Keys Server 在 Windows 平台上存在基于栈的缓冲区溢出漏洞以及权限验证缺失漏洞。该服务器未对 HTTP 请求中第一个字段的长度进行检查，攻击者可构造恶意 HTTP 请求并发送至 Sentinel Keys Server，从而可能导致以 NT AUTHORITY\SYSTEM 权限执行远程代码。 此漏洞影响 Sentinel Keys Server 1.3.8.0 之前的所有版本。

CVSS 9.8 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
Thalesgroup Sentinel Keys Server < 1.3.8.0 affected
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I. Basic Information for CVE-2026-78403

Vulnerability Information
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Vulnerability Title
Unauthenticated Stack Buffer Overflow in Sentinel Keys Server
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Thalesgroup Sentinel Keys Server 0 ~ 1.3.8.0 -

II. Public POCs for CVE-2026-78403

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III. Intelligence Information for CVE-2026-78403

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Other References for CVE-2026-78403 (1)

IV. Related Vulnerabilities

Same product: Sentinel Keys Server
Same vendor: Thalesgroup
Same weakness: CWE-121