Quick answers
- Is CVE-2026-34464 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-34464 being exploited in the wild.
- How severe is CVE-2026-34464?
- High severity, with a CVSS score of 8.8, published 5 May 2026.
- Which products and versions are affected?
- Sandboxie-Plus <= 1.17.2.
- Is there a fix for CVE-2026-34464?
- 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-2026-34464 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2026-34464?
- 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 the `NamedPipeServer::OpenHandler` function within the Sandboxie-Plus service (`SbieSvc`). The vulnerability is caused by the use of `wcscat` to copy the `server` field from a `NAMED_PIPE_OPEN_REQ` structure into a fixed-size `WCHAR pipename[160]` stack buffer without verifying null termination or length. Because the service pipe accepts variable-length messages, a local attacker within a sandbox can craft a request where the `server` field is not null-terminated and is followed by malicious data. This causes `wcscat` to read past the intended field and overflow the stack buffer. Successful exploitation allows for a sandbox escape and arbitrary code execution in the context of the SYSTEM service. The issue is addressed in version 1.17.3 by implementing proper bounds checking.
Affected products
- sandboxie-plus Sandboxie-Plus <= 1.17.2
Timeline
- 2026-05-04: advisory: Vendor advisory published on GitHub
- 2026-05-05: disclosed: CVE published to NVD
- 2026-05-05: patched: Fixed in version 1.17.3