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CVE-2026-34461

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, the SbieIniServer RunSbieCtrl handler contains a stack buffer overflow. The MSGID_SBIE_INI_RUN_SBIE_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.

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-2026-34461 being actively exploited?

CVE-2026-34461 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-2026-34461?

CVE-2026-34461 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-2026-34461?

Affected products include Sandboxie-plus Sandboxie.

How do I fix CVE-2026-34461?

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-2026-34461 against the real software inventory on every managed device, every day. 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.