GHSA-4w7m-58cg-cmff OpenClaw: Leaf subagents could steer sibling sessions across sandbox boundaries

• npm openclaw: < 2026.3.11 → fixed in 2026.3.11

Summary In affected versions of `openclaw`, sandboxed leaf subagents could still access the `subagents` control surface and resolve against the parent requester scope instead of remaining confined to their own session tree. Impact A low-privilege sandboxed leaf worker could steer or kill a sibling run owned by the same requester and cause that sibling to execute with its own broader tool policy. This is a sandbox and session-scope boundary bypass. Affected Packages and Versions • Package: `openclaw` (npm) • Affected versions: `<= 2026.3.8` • Fixed in: `2026.3.11` Technical Details Leaf subagents retained the `subagents` tool, and subagent control requests were authorized against the parent requester scope rather than the caller's own spawned descendants. The control path prevented only self-targeting, not cross-sibling steering. Fix OpenClaw now removes `subagents` control access from leaf subagents by default, scopes subagent control to the caller's own descendants, and rejects `steer` and `kill` requests that target runs outside that descendant tree. The fix shipped in `[email protected]`. Workarounds Upgrade to `2026.3.11` or later.