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CVE-2026-78402— 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（Windows 平台）存在基于栈的缓冲区溢出及越界写入漏洞，可导致缓冲区溢出。该服务器未对输入消息中第一个字段的长度进行校验。本地攻击者可构造恶意输入并发送至 Sentinel Keys Server，从而触发代码执行，以 NT AUTHORITY\SYSTEM 权限运行，实现本地权限提升。此问题影响 Sentinel Keys Server 版本低于 1.3.8.0 的所有版本。

CVSS 7.8 · High Updated Oct 31, 2026

Possible ATT&CK Techniques 2 AI

T1068.001 T1203 · Exploitation for Client Execution

Affected Version Matrix 1

Vendor	Product	Version Range	Status
Thalesgroup	Sentinel Keys Server	`< 1.3.8.0`	affected

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Vulnerability Information

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Vulnerability Title

Stack Buffer Overflow in Sentinel Keys Server

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/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-2026-78402

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-78402

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Other References for CVE-2026-78402 (1)

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

https://www.cve.org/CVERecord?id=CVE-2026-78402

IV. Related Vulnerabilities

Same product: Sentinel Keys Server

CVE-2026-78403
Unauthenticated Stack Buffer Overflow in Sentinel Keys Serve

Same vendor: Thalesgroup

Same weakness: CWE-121