RCE in Microsoft Windows
CVE-2026-31995
OpenClaw versions 2026.1.21 prior to 2026.2.19 contain a command injection vulnerability in the Lobster extension's Windows shell fallback mechanism that allows attackers to inject arbitrary commands through tool-provided arguments. When spawn failures trigger shell fallback with shell: true, attackers can exploit cmd.exe command interpretation to execute malicious commands by controlling workflow arguments.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.008 (54.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
- Microsoft Windows
- Openclaw — versions 2026.1.21, 2026.2.19
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-fg3m-vhrr-8gj6 (vendor-advisory, Vendor Advisory, third-party-advisory)
- github.com/openclaw/openclaw/commit/ba7be018da354ea9f803ed356d20464df0437916 (Patch, patch)
- www.vulncheck.com/advisories/openclaw-command-injection-via-windows-shell-fallb… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-31995?
- CVE-2026-31995 is a medium-severity vulnerability in Microsoft Windows, classified under OS Command Injection. CVSS score: 5.3/10. Published 2026-03-19.
- How severe is CVE-2026-31995?
- Medium severity. CVSS v3 base score is 5.3 out of 10.