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

Quick assessment

Affected
sandboxie-plus Sandboxie
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.11% · P1

Possible ATT&CK Techniques 2 AI

T1055 · Process Injection T1574.001 · DLL

Affected Version Matrix 1

VendorProduct Version RangeStatus
sandboxie-plus Sandboxie < 1.17.3 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
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

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