8.4

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2026-44112

CVE-2026-44112: OpenClaw < 2026.4.22 - Symlink Swap Race Condition in OpenShell FS Bridge Writes

OpenClaw before 2026.4.22 contains a time-of-check/time-of-use race condition in OpenShell sandbox filesystem writes that allows attackers to redirect writes outside the intended mount root. Attackers can exploit symlink swaps during filesystem operations to bypass sandbox restrictions and write files outside the local mount root.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-44112

CVE-2026-44112:

8.4

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
openclaw	npm	<= 2026.4.21	2026.4.22

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the OpenShellFsBridge.writeFile function, located in extensions/openshell/src/fs-bridge.ts. The provided patch clearly shows the modification of this function to mitigate a TOCTOU race condition. The vulnerable code, which involved creating a temporary file and then renaming it, was replaced with a call to a new, more secure function, writeFileWithinRoot. This new function is designed to prevent writes outside of the intended sandbox by validating the target path against the mount root. The test cases added in extensions/openshell/src/openshell-core.test.ts further confirm that the vulnerability is related to symlink manipulation to escape the sandbox, and that the writeFile function is the entry point for this vulnerability.

Vulnerable functions

OpenShellFsBridge.writeFile

extensions/openshell/src/fs-bridge.ts

The `writeFile` function in the `OpenShellFsBridge` class was vulnerable to a time-of-check/time-of-use (TOCTOU) race condition. The original implementation wrote to a temporary file and then renamed it. An attacker could potentially replace the destination path with a symlink between the check and the write, causing the file to be written outside the intended sandbox directory. The patch replaces this logic with a call to `writeFileWithinRoot`, which validates the path and ensures the write operation stays within the designated root directory.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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