Quick answers
- Is CVE-2026-16791 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-16791 being exploited in the wild.
- How severe is CVE-2026-16791?
- Low severity, with a CVSS score of 3.9, published 4 August 2026.
- Which products and versions are affected?
- Lenovo XClarity Essentials OneCLI 5.5.0 and below.
- Is there a fix for CVE-2026-16791?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-16791 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2026-16791?
- Check whether you run Lenovo XClarity Essentials OneCLI 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
This is a temporary file creation vulnerability (insecure tempfile handling) in the Linux version of XClarity Essentials OneCLI 5.5.0 and earlier. The vulnerable component creates temporary files in a manner that allows predictable naming or locations, enabling a local low-privileged attacker to exploit a time-of-check-time-of-use (TOCTOU) race condition. When OneCLI is executed with elevated privileges, an attacker can overwrite or truncate arbitrary local files with program-generated data. The attack requires local access and execution context on the affected system, but does not require authentication. Mitigation involves upgrading to a patched version above 5.5.0.
Affected products
- Lenovo XClarity Essentials OneCLI 5.5.0 and below
Timeline
- 2026-08-04: disclosed