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TI-2026-83334 Aliases CVE-2026-78403GHSA-fxcq-q77c-fh3w

Unauthenticated Stack Buffer Overflow in Sentinel Keys Server

Priority MEDIUM 41CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution, Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121, CWE-862 and the CVSS impact.

Summary

Thales Sentinel Keys Server on Windows, from 0 before 1.3.8.0, has a stack-based buffer overflow and a missing authorization check. The server does not check the length of the first field in an HTTP request, so a stack buffer overflows. An unauthenticated remote attacker can send a crafted HTTP request to run code as NT AUTHORITY\SYSTEM.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

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.

Why it matters now

EPSS 0.00577 47th percentileScored 2026-11-07
Fix Fixed Sentinel Keys Server (Thalesgroup): 1.3.8.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ThalesSentinel Keys Serverbefore 1.3.8.01.3.8.0Patch availableCNA
  • Sentinel Keys Server VendorThales Affected before 1.3.8.0 Fixed in 1.3.8.0 Patch available CNA

Remediation

Update Sentinel Keys Server to version 1.3.8.0 or later, which is the fixed version listed for Thalesgroup Sentinel Keys Server.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

  • Fix · CNA Sentinel Keys Server (Thalesgroup) Fixed in 1.3.8.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Thalesgroup Sentinel Keys Server — supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb…

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-83333 Stack buffer overflow in Thales Sentinel Keys ServerPriority LOW 31
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-78403
  2. 2026-10-30 Alias added: GHSA-fxcq-q77c-fh3w

References

Advisory 1

  • TI-2021-12537 The Sentinel LDK Run-Time Environment installer (Versions 7.6 and prior) adds a firewall… CVSS 3.1CRITICAL 9.8
  • TI-2026-15119 SConnect: Native Host Unauthenticated Remote Code Execution Vulnerability CVSS 4.0CRITICAL 9.4
  • TI-2026-05969 Vulnerability on Cryptobox external sharing feature CVSS 4.0MEDIUM 6.9
  • TI-2024-00179 Privilege Escalation in Thales SafeNet Sentinel HASP LDK CVSS 3.1HIGH 7.8
  • TI-2023-06413 Privilege Escalation in SafeNet Authentication Client CVSS 3.1HIGH 7.8
  • TI-2023-05523 Privilege Escalation in SafeNet Authentication Client Installer CVSS 3.1HIGH 7.8
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences