OpenClaw: Sandboxed /acp spawn requests could initialize host ACP sessions

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.8 · CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-27646: 0.11% estimated exploitation activity in the next 30 days; percentile 1.18 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Sandboxed requester sessions could reach host-side ACP session initialization through /acp spawn. OpenClaw already blocked sessionsspawn({ runtime: "acp" }) from sandboxed sessions, but the slash-command path initialized ACP directly without applying the same host-runtime guard first. Affected Packages / Versions - npm package: openclaw - Affected versions: <= 2026.3.2 - Patched version: = 2026.3.7 Details ACP sessions run on the host, not inside the OpenClaw sandbox. The direct ACP spawn path in src/agents/acp-spawn.ts already denied sandboxed requesters, but /acp spawn in src/auto-reply/reply/commands-acp/lifecycle.ts called initializeSession(...) without first applying the same restriction. In affected versions, an already authorized sender in a sandboxed session could use /acp spawn to cross from sandboxed chat context into host-side ACP runtime initialization when ACP was enabled and a backend was available. Fix Commit(s) - 61000b8e4ded919ca1a825d4700db4cb3fdc56e3 Fix…

Published by the source

9 Mar 2026, 19:54 UTC

Last modified by the source

30 Mar 2026, 13:49 UTC

Source last checked

26 Oct 2026, 12:47 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-9q36-67vc-rrwg

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-9q36-67vc-rrwg

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# Patch Next advisory brief: CVE-2026-27646

Advisory: OpenClaw: Sandboxed /acp spawn requests could initialize host ACP sessions
IDs: CVE-2026-27646, GHSA-9q36-67vc-rrwg
Record: https://patchnext.com/advisories/cve-2026-27646 (revision 3, source checked 26 Oct 2026, 12:47 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: openclaw 2026.3.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm openclaw: affected <= 2026.3.2; fixed in 2026.3.7

## Suggested inspection (read-only)
- `npm ls openclaw --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on openclaw.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-9q36-67vc-rrwg (OSV record GHSA-9q36-67vc-rrwg lists affected ranges: npm openclaw >=0 <2026.3.7 (fixed))
- Verified: https://github.com/advisories/GHSA-9q36-67vc-rrwg (GitHub-reviewed advisory GHSA-9q36-67vc-rrwg lists affected ranges: npm openclaw >=0 <=2026.3.2)

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