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 MSGIDSBIEINIRUNSBIE_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.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-121"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34461.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.17.3"
}
],
"cpe": "cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*",
"source": [
"AFFECTED_FIELD",
"CPE_RANGE"
]
}