What’s Vulnerable › Vulnerabilities
CVE-2026-34461: Sandboxie-Plus SbieIniServer RunSbieCtrl stack buffer overflow allows local privilege escalation
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-05-05 · updated 2026-07-24
- Weakness: CWE-121
Description
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.
Affected products
- sandboxie-plus Sandboxie: before 1.17.3 — fixed in 1.17.3
How to fix
Upgrade to a fixed version: sandboxie-plus Sandboxie 1.17.3. Check the vendor advisory for mitigations.
References
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