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TI-2026-26729 Aliases CVE-2026-34464

Sandboxie-Plus NamedPipeServer OpenHandler stack overflow via unterminated server field

Priority LOW 39CWE-121Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Code execution
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 and the CVSS impact.

Summary

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, NamedPipeServer::OpenHandler copies the server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] stack buffer using wcscat without verifying null termination. The handler only enforces a minimum packet size, and since the service pipe accepts variable-length messages, a sandboxed caller can fill the server[48] field with non-zero data and append additional controlled wide characters after the structure. wcscat then reads past the fixed field and overflows the stack buffer in the SYSTEM service. This message is restricted to sandboxed callers, making it a sandbox escape vector. This can lead to a crash of the SbieSvc service or potential code execution as SYSTEM. This issue has been fixed in version 1.17.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00174 6th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Sandboxie (sandboxie-plus): 1.17.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sandboxie-plusSandboxiebefore 1.17.31.17.3Patch availableCNA
  • Sandboxie Vendorsandboxie-plus Affected before 1.17.3 Fixed in 1.17.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*before 1.17.3Vulnerablesandboxie-plus
  • cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:* Versions before 1.17.3 Vulnerable ·sandboxie-plus

Remediation

  • Fix · CNA Sandboxie (sandboxie-plus) Fixed in 1.17.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34464

References

Exploit 1

  • TI-2025-40067 Sandboxie's Integer Overflow in SbieIniServer::RC4Crypt allows sandbox escape and SYSTEM compromise CVSS 4.0CRITICAL 9.9
  • TI-2026-26723 Sandboxie-Plus privilege escalation via INI CRLF injection bypassing EditAdminOnly CVSS 4.0CRITICAL 9.3
  • TI-2024-32948 Path traversal in Sandboxie CVSS 3.1CRITICAL 9.2
  • TI-2026-26724 Sandboxie-Plus sandbox escape via uninitialized memory leak and stack overflow in GetRawInputDeviceInfoSlave CVSS 4.0HIGH 8.8
  • TI-2026-25112 Sandboxie kernel driver denial of service via malformed IOCTL from sandboxed process CVSS 4.0HIGH 8.2
  • TI-2025-29386 Sandboxie Arbitrary Kernel Write in SbieDrv.sys API (API_GET_SECURE_PARAM) CVSS 3.1HIGH 7.8
See all 16 →

Sources

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