Vulnerability · Published May 5, 2026 · Assigned by GitHub_M
CVE-2026-34461Sandboxie-Plus SbieIniServer RunSbieCtrl stack buffer overflow allows local privilege escalation
High 7.3
In plain English
A high-severity stack buffer overflow in Sandboxie from sandboxie-plus. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| sandboxie-plus | Sandboxie | < 1.17.3 |
Weakness: CWE-121 · Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N