How severe is CVE-2026-27646?

No CVSS score has been assigned to CVE-2026-27646 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-27646?

CVE-2026-27646 affects the following packages: openclaw (npm). Ecosystems affected: npm.

How do I fix CVE-2026-27646?

Update openclaw to 2026.3.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-27646 is resolved across your whole dependency graph.

How do I detect CVE-2026-27646 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openclaw, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-27646 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2026-27646?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-27646 can be triaged on real exposure rather than presence alone.

Is CVE-2026-27646 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-27646 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-27646?

CVE-2026-27646 has an EPSS (Exploit Prediction Scoring System) score of 0.1%, placing it in the 1th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-27646?

CVE-2026-27646 is classified as CWE-863 (CWE-863). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-27646 published, and has it been updated?

CVE-2026-27646 was published on March 23, 2026 and was last updated on August 12, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2026-27646 — openclaw

Fix: openclaw/openclaw@61000b8

CVE-2026-27646 is a CWE-863 vulnerability in openclaw. A fix is available for openclaw — see the affected versions and patch details below.

OpenClaw < 2026.3.7 - Sandbox Escape via /acp spawn Command

Also known asGHSA-9q36-67vc-rrwg

Published

Mar 23, 2026

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-27646.

EPSS Exploitation Probability

via FIRST.org ↗

0.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs1th percentile — riskier than 1% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

133other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

openclawnpm

2.7Mdownloads / week

Description

Summary

Sandboxed requester sessions could reach host-side ACP session initialization through /acp spawn.

OpenClaw already blocked sessions_spawn({ 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 Details

The fix introduced a shared ACP runtime-policy guard in src/agents/acp-spawn.ts and reused it from the /acp spawn handler in src/auto-reply/reply/commands-acp/lifecycle.ts before any ACP backend initialization. Regression coverage was added in src/auto-reply/reply/commands-acp.test.ts to prove sandboxed /acp spawn requests are rejected early, while existing ACP spawn behavior for non-sandboxed sessions remains unchanged.

Release Process Note

Patched version is pre-set to 2026.3.7 so the advisory can be published once that npm release is available.

Thanks @tdjackey for reporting.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`openclaw`	all versions	2026.3.7`npm install openclaw@2026.3.7`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openclaw, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update openclaw to 2026.3.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-27646 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-27646 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-27646. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Summary Sandboxed requester sessions could reach host-side ACP session initialization through `/acp spawn`. OpenClaw already blocked `sessions_spawn({ 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,

O3 Security · Impact-Aware SCA

Is CVE-2026-27646 in your dependencies?

O3 Security finds CVE-2026-27646 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

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