CVE-2026-28460: OpenClaw's system.run allowlist bypass via shell line-continuation command substitution

Summary

In OpenClaw system.run allowlist mode, shell-wrapper analysis could be bypassed by splitting command substitution as $\\ + newline + ( inside double quotes. Analysis treated the payload as allowlisted (for example /bin/echo), while shell runtime folded the line continuation into $(...) and executed non-allowlisted subcommands.

Affected Packages / Versions

• Package: npm openclaw
• Latest published affected version: 2026.2.21-2
• Affected range: <=2026.2.21-2
• Patched version (planned next release): 2026.2.22

Impact

In deployments that opt into tools.exec.security=allowlist (with ask=on-miss or off), this can bypass approval boundaries and lead to unintended command execution.

Fix Commit(s)

• 3f0b9dbb36c86e308267924c0d3d4a4e1fc4d1e9

Remediation

• Upgrade to 2026.2.22 (or newer) when published.
• Temporary mitigation: set tools.exec.ask=always or tools.exec.security=deny.

Release Process Note

patched_versions is pre-set to planned next release 2026.2.22. After npm release is out, this advisory should be ready for direct publish without additional metadata edits.

OpenClaw thanks @tdjackey for reporting.