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CVE-2026-34464

Sandboxie-plus Sandboxie buffer overflow

8.8 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, NamedPipeServer::OpenHandler copies the server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] stack buffer using wcscat without verifying null termination. The handler only enforces a minimum packet size, and since the service pipe accepts variable-length messages, a sandboxed caller can fill the server[48] field with non-zero data and append additional controlled wide characters after the structure. wcscat then reads past the fixed field and overflows the stack buffer in the SYSTEM service. This message is restricted to sandboxed callers, making it a sandbox escape vector. 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
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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-2026-34464 being actively exploited?

CVE-2026-34464 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-2026-34464?

CVE-2026-34464 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.15% probability of exploitation.

Which products are affected by CVE-2026-34464?

Affected products include Sandboxie-plus Sandboxie.

How do I fix CVE-2026-34464?

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

Secuno correlates vulnerabilities like CVE-2026-34464 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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