CVE-2026-35570: OpenClaude has Sandbox Bypass via Early-Exit Logic Flaw that Allows Path Traversal

Severity: high (CVSS 8.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-21 · updated 2026-10-26
Weakness: CWE-22

Description

OpenClaude is an open-source coding-agent command line interface for cloud and local model providers. Versions prior to 0.5.1 have a logic flaw in `bashToolHasPermission()` inside `src/tools/BashTool/bashPermissions.ts`. When the sandbox auto-allow feature is active and no explicit deny rule is configured, the function returns an `allow` result immediately — before the path constraint filter (`checkPathConstraints`) is ever evaluated. This allows commands containing path traversal sequences (e.g., `../../../../../etc/passwd`) to bypass directory restrictions entirely. Version 0.5.1 contains a patch for the issue.

Affected products

Gitlawb openclaude: before 0.5.1 — fixed in 0.5.1

How to fix

Upgrade to a fixed version: Gitlawb openclaude 0.5.1. Check the vendor advisory for mitigations.

References

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