CVE-2026-27646Network attack vector

Sandbox escape via unguarded ACP session initialization

Published Mar 23, 2026 · Updated Mar 23, 2026

Sandbox escape in OpenClaw before 2026.3.7 allows remote authenticated users to initialize host-side ACP sessions via /acp spawn. The command handler in src/auto-reply/reply/commands-acp/lifecycle.ts calls initializeSession without applying the sandbox runtime-policy guard used by the direct spawn path. Exploitation requires an authorized sender in a sandboxed session, ACP enabled, and an available backend; successful requests initialize ACP outside the sandbox on the host runtime.

CVSS severity5.8
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in OpenClaw before 2026.3.7 allows remote authenticated users to initialize host-side ACP sessions via /acp spawn. The command handler in src/auto-reply/reply/commands-acp/lifecycle.ts calls initializeSession without applying the sandbox runtime-policy guard used by the direct spawn path. Exploitation requires an authorized sender in a sandboxed session, ACP enabled, and an available backend; successful requests initialize ACP outside the sandbox on the host runtime.

The record

CVE
CVE-2026-27646
Published
Mar 23, 2026
Updated
Mar 23, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-863, T1611
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.3.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.3.7

Published CVSS scores

5.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
6.1VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
5.9OpenClawCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1611Escape to Host

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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