CVE-2026-42424 Overview
CVE-2026-42424 is a local file exfiltration vulnerability affecting OpenClaw before version 2026.4.8. The vulnerability exists because OpenClaw treats shared reply MEDIA paths as trusted without proper validation, allowing attackers to craft malicious references that trigger cross-channel local file exfiltration. This flaw is classified as CWE-73 (External Control of File Name or Path).
Critical Impact
Attackers can exploit crafted shared reply MEDIA references to cause another channel to read local file paths as trusted generated media, potentially exfiltrating sensitive local files.
Affected Products
- OpenClaw versions prior to 2026.4.8
- OpenClaw Node.js package (openclaw:openclaw)
Discovery Timeline
- 2026-04-28 - CVE-2026-42424 published to NVD
- 2026-04-30 - Last updated in NVD database
Technical Details for CVE-2026-42424
Vulnerability Analysis
This vulnerability stems from improper handling of shared reply MEDIA paths within OpenClaw's cross-channel communication mechanism. When processing media references shared between channels, OpenClaw fails to validate whether the referenced file paths are legitimate generated media or arbitrary local files. This trust assumption allows an attacker to craft malicious shared reply references that point to sensitive local files on the system.
The attack requires network access and some level of privilege within the OpenClaw environment. User interaction is also necessary, as the victim must process the crafted shared reply. Successful exploitation results in unauthorized access to confidential local file contents without impacting system integrity or availability.
Root Cause
The root cause is CWE-73: External Control of File Name or Path. OpenClaw's media handling component accepts file paths from shared reply references without performing adequate validation to ensure the paths correspond to legitimate, application-generated media content. This allows external input to control which files are accessed and potentially transmitted across channels.
Attack Vector
The attack is network-based and involves crafting a malicious shared reply MEDIA reference. The attacker creates a specially crafted reference pointing to a local file path (such as configuration files, credentials, or other sensitive data) instead of legitimate generated media. When another channel processes this shared reply as trusted media, it inadvertently reads and potentially exposes the contents of the targeted local file.
The vulnerability mechanism operates through the shared reply feature where media paths are exchanged between channels. An attacker with the ability to create shared replies can inject arbitrary file paths that the receiving channel will treat as trusted media content, leading to local file disclosure. For detailed technical analysis, refer to the GitHub Security Advisory.
Detection Methods for CVE-2026-42424
Indicators of Compromise
- Unusual file access patterns involving sensitive local files through the OpenClaw media processing component
- Shared reply references containing unexpected file paths outside the designated media directories
- Cross-channel communications referencing system configuration files or credential stores
- Log entries showing media path resolutions to non-standard locations
Detection Strategies
- Monitor OpenClaw logs for shared reply MEDIA references containing absolute paths or path traversal sequences
- Implement file integrity monitoring on sensitive local files that should not be accessed by OpenClaw
- Configure application-level logging to track all file path resolutions within the media handling component
- Deploy endpoint detection rules to identify anomalous file read operations initiated by OpenClaw processes
Monitoring Recommendations
- Enable verbose logging for OpenClaw's media handling and shared reply processing functions
- Set up alerts for file access attempts outside the designated media storage directories
- Monitor network traffic for exfiltration patterns following shared reply processing events
- Review cross-channel communication logs for suspicious media path references
How to Mitigate CVE-2026-42424
Immediate Actions Required
- Upgrade OpenClaw to version 2026.4.8 or later immediately
- Audit existing shared reply media references for any suspicious file paths
- Implement network segmentation to limit the impact of potential file exfiltration
- Review access controls for sensitive local files on systems running OpenClaw
Patch Information
The vulnerability has been addressed in OpenClaw version 2026.4.8. The fix implements proper validation of shared reply MEDIA paths to ensure only legitimate generated media can be referenced. The security patch is available through the GitHub commit d7c3210cd6f5fdfdc1beff4c9541673e814354d5. Additional details are available in the GitHub Security Advisory and the VulnCheck Advisory.
Workarounds
- Restrict shared reply functionality to trusted channels only until the patch can be applied
- Implement application-level firewall rules to filter shared replies containing suspicious path patterns
- Configure file system permissions to limit OpenClaw's read access to only necessary directories
- Deploy additional monitoring to detect and alert on potential exploitation attempts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
