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CVE-2026-34462

Sandboxie-plus Sandboxie buffer overflow

7.8 HIGHPublic exploitEPSS 0.15%
  1. Published5 May 2026

Description

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, several ProcessServer handlers (KillAllHandler, SuspendAllHandler, and RunSandboxedHandler) copy a WCHAR boxname[34] field from request structures into WCHAR[40] stack buffers using wcscpy without verifying null termination. Because the service pipe accepts variable-length packets larger than the request structure, an attacker can fill the boxname field with non-zero data and append additional controlled wide characters after the structure. wcscpy then reads past the fixed field and overflows the destination stack buffer. The service pipe is created with a NULL DACL, allowing any local process to connect, and the unsafe copy occurs before authorization checks. 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 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Sandboxie-plus Sandboxie< 1.17.3

Remediation

Fixed in
Sandboxie-plus Sandboxie≥ 1.17.3

References

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Frequently asked

Is CVE-2026-34462 being actively exploited?

CVE-2026-34462 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.15%.

How severe is CVE-2026-34462?

CVE-2026-34462 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.15% probability of exploitation.

Which products are affected by CVE-2026-34462?

Affected products include Sandboxie-plus Sandboxie.

How do I fix CVE-2026-34462?

Upgrade affected software to a fixed version, for example Sandboxie-plus Sandboxie 1.17.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.