# CVE-2026-34462: Sandboxie-Plus stack buffer overflow in ProcessServer

Source: https://junglewise.ai/threats/cve-2026-34462-sandboxie-plus-stack-buffer-overflow-in-processserver  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-05. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-34462 · Severity: high · CVSS 7.8 · Published 2026-05-05

Sandboxie-Plus is a security tool used to run applications in an isolated environment to protect the rest of the Windows operating system. A flaw in how the software handles internal communication allows a local user to send specially crafted messages that overflow the system's memory. This can lead to a complete crash of the security service or allow an attacker to gain full administrative control (SYSTEM privileges) over the computer.

Technologies: [Sandboxie-Plus Sandboxie](https://junglewise.ai/threats/technologies/sandboxie), [Sandboxie-Plus](https://junglewise.ai/threats/technologies/sandboxie-plus). Vendors: [Sandboxie-Plus](https://junglewise.ai/threats/vendors/sandboxie-plus).

## Quick answers

**Is CVE-2026-34462 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34462 being exploited in the wild.

**How severe is CVE-2026-34462?** High severity, with a CVSS score of 7.8, published 5 May 2026.

**Which products and versions are affected?** Sandboxie-Plus <= 1.17.2.

**Is there a fix for CVE-2026-34462?** A patch was published on 2026-05-05: Fixed in version 1.17.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34462 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-34462?** Check whether you run Sandboxie-Plus Sandboxie or Sandboxie-Plus at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in Sandboxie-Plus versions 1.17.2 and earlier within the ProcessServer handlers (KillAllHandler, SuspendAllHandler, and RunSandboxedHandler). The vulnerability is caused by the use of 'wcscpy' to copy a WCHAR boxname[34] field from a request structure into a WCHAR[40] stack buffer without verifying null termination. Because the service pipe is created with a NULL DACL and accepts variable-length packets larger than the request structure, a local attacker can append controlled data after the structure to trigger the overflow. This occurs before authorization checks, potentially allowing an unprivileged local user to execute arbitrary code with SYSTEM privileges. The issue is addressed in version 1.17.3.

## Affected products

- sandboxie-plus Sandboxie-Plus <= 1.17.2

## Timeline

- 2026-05-04: advisory: GitHub advisory published by maintainer
- 2026-05-05: disclosed: CVE-2026-34462 published
- 2026-05-05: patched: Fixed in version 1.17.3

## References

- [https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-9cjg-vh9m-hhx4](https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-9cjg-vh9m-hhx4)

## Related threats

- [Sandboxie-Plus sandbox escape via APC injection in GuiServer](https://junglewise.ai/threats/cve-2026-45313-sandboxie-plus-sandbox-escape-via-apc-injection-in-guiserver)
- [Sandboxie-Plus privilege escalation via TOCTOU in UpdUtil](https://junglewise.ai/threats/cve-2026-34596-sandboxie-plus-privilege-escalation-via-toctou-in-updutil)
- [Sandboxie-Plus entropy loss in EditPassword hashing](https://junglewise.ai/threats/cve-2026-34527-sandboxie-plus-entropy-loss-in-editpassword-hashing)
- [Sandboxie-Plus stack overflow in NamedPipeServer OpenHandler](https://junglewise.ai/threats/cve-2026-34464-sandboxie-plus-stack-overflow-in-namedpipeserver-openhandler)
- [Sandboxie-Plus stack buffer overflow in SbieIniServer RunSbieCtrl](https://junglewise.ai/threats/cve-2026-34461-sandboxie-plus-stack-buffer-overflow-in-sbieiniserver-runsbiectrl)