sandboxie-plus Sandboxie up to 1.17.2 on Windows SbieIniServer RunSbieCtrl stack-based overflow

Summaryinfo

A vulnerability classified as critical was found in sandboxie-plus Sandboxie up to 1.17.2 on Windows. This affects an unknown part of the component SbieIniServer RunSbieCtrl Handler. The manipulation results in stack-based overflow. This vulnerability is reported as CVE-2026-34461. The attack requires a local approach. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in sandboxie-plus Sandboxie up to 1.17.2 on Windows. Affected is an unknown function of the component SbieIniServer RunSbieCtrl Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, the SbieIniServer RunSbieCtrl handler contains a stack buffer overflow. The MSGID_SBIE_INI_RUN_SBIE_CTRL message is handled before normal sandbox and impersonation checks, and for non-sandboxed callers, the handler copies the trailing message payload into a fixed-size WCHAR ctrlCmd[128] stack buffer using memcpy without verifying the length fits within the buffer. The service pipe is created with a NULL DACL, allowing any local interactive process to connect and send an oversized payload to overflow the stack. 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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-34461 since 03/27/2026. The exploitability is told to be difficult. Local access is required to approach this attack. The technical details are unknown and an exploit is not available.

Upgrading to version 1.17.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-27461). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• sandboxie-plus

Name

• Sandboxie

Version

• 1.17.0
• 1.17.1
• 1.17.2

Website

• Product: https://github.com/sandboxie-plus/Sandboxie/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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