CVE-2026-44995CWE-829

OpenClaw < 2026.4.20 - Arbitrary Code Execution via MCP stdio Environment Variables

Medium · published May 11, 2026

CVSS v4.0
5.4
EPSS
0%
Percentile
9.6
In the wild
Unconfirmed
What it is

OpenClaw before 2026.4.20 contains an improper environment variable validation vulnerability in MCP stdio server configuration that allows attackers to execute arbitrary code. Malicious workspace configurations can pass dangerous startup variables like NODE_OPTIONS, LD_PRELOAD, or BASH_ENV to spawned MCP server processes, enabling code injection when operators start sessions using those servers.

The record
Technical detail
CVSS v4.0
5.4 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00202 · 9.6th percentile
Weakness
CWE-829 · Inclusion of Functionality from Untrusted Control Sphere
Published
2026-05-11T16:46Z
EPSS history
Timeline
  • 11 MAY 16:46Z
    OpenClaw < 2026.4.20 - Arbitrary Code Execution via MCP stdio Environment Variables
    cvelistv5