Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sandboxie-Plus | Sandboxie | < 1.17.3 |
Related Weaknesses (CWE)
References
- https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-wpjw-jh2p-gExploitMitigationVendor Advisory
FAQ
What is CVE-2026-34461?
CVE-2026-34461 is a vulnerability with a CVSS score of 7.8 (HIGH). 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_IN...
How severe is CVE-2026-34461?
CVE-2026-34461 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34461?
Check the references section above for vendor advisories and patch information. Affected products include: Sandboxie-Plus Sandboxie.