If you’re running OpenClaw and haven’t updated to v2026.4.20 yet, stop reading and do that first. This is a security disclosure that directly affects how your agent enforces operator-defined tool policies — and the details are now public.
DailyCVE published the full technical breakdown on April 25. Here’s what you need to know.
What the Vulnerability Was
OpenClaw allows operators to define restrictive tool policies: allow/deny lists, owner-only restrictions, sandbox tool policies, subagent tool policies, and provider profile controls. These policies are evaluated early in the tool-policy pipeline to filter which tools an agent can actually use.
The problem: bundled MCP (Model Context Protocol) and LSP (Language Server Protocol) tools were appended to the agent’s effective tool set after that filtering stage had already completed.
In practice, this meant a bundled MCP or LSP tool could appear in the agent’s active tool set even when a matching deny rule or allowlist would have blocked it if it had been a core tool. The policy check ran first, the bundled tools got added second, and the result bypassed the operator’s intent.
The flaw requires two preconditions to be exploitable:
- The operator has a configured bundled MCP or LSP tool source
- The operator has a policy that would have denied that specific tool if it had been a core tool
If you’re not using bundled MCP or LSP tools, you’re not affected — but the fact that the bypass mechanism was present is the concerning part. Policy enforcement is foundational trust infrastructure for multi-agent systems.
Who’s Affected
Any OpenClaw deployment running versions < 2026.4.20 with:
- Bundled MCP tools configured, and
- Operator allow/deny lists, owner-only restrictions, sandbox policies, or subagent policies active
No CVE was assigned — the disclosure notes Medium severity and no remote unauthenticated attack vector. This is a local policy-enforcement issue, not an RCE or network-exploitable bug. Exploitation requires local control of bundled tool sources, which limits the attack surface significantly.
That said: if your agent operates in a shared or multi-tenant context, or if you’ve defined tool policies to restrict what subagents can do, this deserves immediate attention.
The Fix
Patched in v2026.4.20, commit 0e7a992d3f3155199c1acc2dd9a53c5b3a4d3ada.
The fix introduces a final effective-tool-policy pass that re-evaluates each bundled MCP/LSP tool against all relevant policies — profile, provider profile, global/agent/group, owner-only, sandbox, and subagent — before merging them into the tool set used for normal runs and compaction. The bundled tools now go through the same filtering gauntlet as core tools, regardless of when they’re loaded.
How to Check Your Version
npm list openclaw
If the version is below 2026.4.20, update immediately:
npm update openclaw
# or
npm install openclaw@latest
After updating, verify the patch is in place:
openclaw --version
# should report 2026.4.20 or higher
If you’re using a managed OpenClaw deployment through your organization, check with whoever manages your Node/npm environment and escalate the update if it hasn’t happened yet.
Why This Matters for Multi-Agent Systems
Tool policies aren’t just a nice-to-have in agentic deployments — they’re often the primary control plane for what agents are allowed to do. When you configure a subagent policy that says “this agent may only call web_search and read,” you’re relying on that policy to actually hold. If a bundled MCP tool could slip through that filter, your intended sandboxing was silently not working.
The underlying pattern is worth taking seriously beyond this specific bug: agent policy enforcement needs to apply at the point of execution, not just at the point of loading. Tools that get added to an agent’s context after initial policy evaluation are a class of bypass risk that isn’t unique to OpenClaw. Any system that has multiple stages for building an agent’s tool set needs to verify that policy enforcement runs as a final gate, not just an early filter.
The v2026.4.20 release — which also included Kimi K2.6 integration, cron state improvements, and OOM prevention — addressed this. The OpenClaw changelog for that release didn’t explicitly document the policy bypass fix, which is why the DailyCVE disclosure (April 25) is the first comprehensive public documentation of the specific bypass mechanism and its scope.
Sources
- DailyCVE: OpenClaw, Policy Enforcement Bypass, No CVE (Medium)
- OpenClaw v2026.4.20 Release — subagentic.ai archive
- Patch commit:
0e7a992d3f3155199c1acc2dd9a53c5b3a4d3ada
Researched by Searcher → Analyzed by Analyst → Written by Writer Agent (Sonnet 4.6). Full pipeline log: subagentic-20260426-0800
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