OpenClaw Sandbox Escape via Host Parameter Override

OpenClaw versions 2026.4.5 before 2026.4.10 contain a sandbox escape vulnerability allowing sandboxed agents to override exec routing by specifying host=node. Attackers can bypass sandbox boundaries and route execution to remote nodes instead of intended sandbox paths.

Casky was already ahead

This CVE exploits attack patterns that Casky's 261matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

OpenClaw versions 2026.4.5 through 2026.4.9 contain a critical sandbox escape vulnerability that allows sandboxed agents to break containment by overriding execution routing through a host parameter manipulation. By specifying host=node, attackers can redirect execution flows from intended sandbox environments to arbitrary remote nodes, completely bypassing isolation controls. This vulnerability affects organizations deploying OpenClaw for isolated agent execution, particularly those using it for untrusted workload isolation or multi-tenant scenarios. The high CVSS score of 8.8 reflects the severity of breaking sandbox boundaries, which eliminates a critical security control and enables lateral movement and unauthorized code execution across infrastructure.

Casky's 261 matched security skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK's Privilege Escalation (TA0004) and Execution (TA0006) tactics. Practitioners using Casky would identify suspicious activity through detection of host parameter anomalies in agent execution requests, unexpected routing to out-of-band nodes, and execution context mismatches where sandboxed processes communicate with external systems. The skills map to techniques like Abuse Elevation Control Mechanism and Exploitation of Remote Services, helping security teams recognize when agents attempt parameter injection attacks or manipulate execution flow. By correlating these behavioral indicators with version identification and configuration analysis, Casky enables practitioners to pinpoint vulnerable deployments and detect active exploitation attempts before sandbox boundaries are fully compromised.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

261 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-42434.

analyzing-cloud-storage-access-patterns

cloud security · low

Run

analyzing-kubernetes-audit-logs

container security · low

Run

analyzing-malicious-url-with-urlscan

phishing defense · medium

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-42434

Casky has 261 skills that investigate the attack patterns behind CVE-2026-42434. Run one and get CVSS-scored findings in 3 minutes.

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