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CVE-2026-34596— Sandboxie-Plus local privilege escalation via TOCTOU race condition in UpdUtil addon installation

AI Predicted 8.1 Difficulty: Moderate EPSS 0.11% · P1

Affected Version Matrix 1

VendorProductVersion RangeStatus
sandboxie-plusSandboxie< 1.17.3affected
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I. Basic Information for CVE-2026-34596

Vulnerability Information
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Vulnerability Title
Sandboxie-Plus local privilege escalation via TOCTOU race condition in UpdUtil addon installation
Source: NVD (National Vulnerability Database)
Vulnerability Description
Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, a Time-of-Check-to-Time-of-Use (TOCTOU) race condition exists during addon installation. When a user installs an addon through the SandMan interface, UpdUtil.exe is spawned as SYSTEM by SbieSvc but stages files in the user-writable %TEMP%\sandboxie-updater directory. After UpdUtil verifies file hashes against the signed addon manifest, install.bat extracts files.cab and executes config.exe from its contents. Between hash verification and extraction, an unprivileged user can replace files.cab with a crafted cabinet containing a malicious executable, which is then run as SYSTEM. No UAC prompt is required. This issue has been fixed in version 1.17.3.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: NVD (National Vulnerability Database)
Vulnerability Title
Sandboxie Plus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sandboxie Plus是Sandboxie Plus开源的一个Windows沙盒隔离工具。 Sandboxie Plus 1.17.2及之前版本存在安全漏洞，该漏洞源于插件安装过程中存在TOCTOU竞争条件，可能导致非特权用户在哈希验证后替换文件并执行恶意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
sandboxie-plusSandboxie < 1.17.3 -

II. Public POCs for CVE-2026-34596

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III. Intelligence Information for CVE-2026-34596

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Vendor Advisories for CVE-2026-34596 (1)

Same Patch Batch · sandboxie-plus · 2026-05-05 · 8 CVEs total

CVE-2026-32603Sandboxie kernel driver denial of service via malformed IOCTL from sandboxed process
CVE-2026-34462Sandboxie-Plus ProcessServer boxname stack buffer overflows via unterminated wide string c
CVE-2026-34458Sandboxie-Plus privilege escalation via INI CRLF injection bypassing EditAdminOnly
CVE-2026-34527Sandboxie-Plus EditPassword hash entropy reduced from 160 bits to 80 bits due to incorrect
CVE-2026-34459Sandboxie-Plus sandbox escape via uninitialized memory leak and stack overflow in GetRawIn
CVE-2026-34464Sandboxie-Plus NamedPipeServer OpenHandler stack overflow via unterminated server field
CVE-2026-34461Sandboxie-Plus SbieIniServer RunSbieCtrl stack buffer overflow allows local privilege esca

IV. Related Vulnerabilities

Same product: Sandboxie
Same vendor: sandboxie-plus
Same weakness: CWE-367

V. Comments for CVE-2026-34596

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