2

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2026-43529

CVE-2026-43529: OpenClaw < 2026.4.10 - Time-of-Check-Time-of-Use (TOCTOU) Race Condition in exec Script Preflight Validator

OpenClaw before 2026.4.10 contains a time-of-check-time-of-use vulnerability in the validateScriptFileForShellBleed function that allows local attackers to bypass workspace boundary checks. An attacker with workspace write access can race-condition swap the target file between validation and preflight read, causing the validator to inspect a different file identity than the one that passed the initial boundary check.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-43529

CVE-2026-43529:

2

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
openclaw	npm	< 2026.4.10	2026.4.10

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The analysis of the provided security advisory and the associated commit b024fae9e5df43e9b69b2daebb72be3469d52e91 clearly indicates a Time-of-check Time-of-use (TOCTOU) vulnerability within the validateScriptFileForShellBleed function in the file src/agents/bash-tools.exec.ts. The vulnerability description explicitly names this function and describes the flawed check-then-read logic. The commit diff provides concrete evidence of this, showing the removal of separate fs.stat and fs.readFile calls and their replacement with a new, safer readFileWithinRoot function. This new function is designed to prevent race conditions by operating on a stable file descriptor rather than a mutable path. Therefore, validateScriptFileForShellBleed is the primary function that would be active during the exploitation of this vulnerability, making it the key runtime indicator.

Vulnerable functions

validateScriptFileForShellBleed

src/agents/bash-tools.exec.ts

The function `validateScriptFileForShellBleed` in `src/agents/bash-tools.exec.ts` was vulnerable to a Time-of-check Time-of-use (TOCTOU) race condition. It performed separate operations to check (e.g., `fs.stat`) and read (`fs.readFile`) a file by its path. An attacker could have swapped the file between the check and the read, leading to the validation being performed on a different file than the one that was ultimately read and processed. The patch replaces this insecure sequence with an atomic `readFileWithinRoot` operation that works on a file descriptor, mitigating the race condition.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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