CVE-2026-10219: GoClaw Command Injection Vulnerability

Technical summary

The FsBridge.WriteFile function in internal/sandbox/fsbridge.go of GoClaw fails to properly sanitize user-supplied input before passing it to system command execution. An attacker can exploit this by crafting malicious input containing shell metacharacters or command sequences that break out of the intended command context. The flaw allows remote code execution with the privileges of the GoClaw process. The issue is classified as CWE-77 (Improper Neutralization of Special Elements) and CWE-78 (OS Command Injection).

Business impact

This vulnerability enables remote attackers to execute arbitrary commands on systems running vulnerable GoClaw versions without authentication. An attacker could read sensitive files, modify system configuration, deploy malware, establish persistence, or pivot to other systems on the network. Organizations using GoClaw in production environments face immediate risk of data breach, operational disruption, and potential supply chain compromise if the tool processes untrusted input.

Affected systems

GoClaw versions 3.11.3 and earlier are affected. The vulnerability resides in the write_file tool component. Any deployment of nextlevelbuilder GoClaw that exposes the write_file functionality (directly or indirectly) to remote or untrusted input is at risk. Check your current GoClaw version and review whether your implementation processes externally-sourced data through this function.

Exploitability

The vulnerability has a low attack complexity—no special conditions or privileges are required to trigger it. Public exploits are available, lowering the barrier to weaponization. The attack is network-accessible and requires no user interaction, making opportunistic attacks feasible. Organizations should assume active exploitation attempts are likely once patch availability is confirmed.

Remediation

Immediately upgrade GoClaw to a version that includes the command injection fix. A pull request addressing this issue is pending acceptance by the maintainers. Monitor the nextlevelbuilder GoClaw repository and security advisories for an official patch release. Until patched, implement network segmentation to restrict access to GoClaw instances, disable the write_file tool if it is not essential to operations, and apply input validation and command allowlisting at the application level if possible.

Patch guidance

Verify against the nextlevelbuilder GoClaw repository and official security advisories for the specific patched version number. The fix is currently pending in a pull request; once merged and released, apply the update immediately. Test in a non-production environment first to ensure compatibility with your deployment. If auto-update is available, enable it; otherwise, plan a maintenance window for manual deployment.

Detection guidance

Monitor for suspicious process spawning or system command execution originating from GoClaw processes. Log and alert on unusual arguments passed to write_file, especially those containing shell metacharacters (|, ;, &, $, `, etc.). Review GoClaw process resource usage for anomalies. Check for unexpected outbound network connections from the GoClaw process. If you have application performance monitoring or security information and event management (SIEM) tooling, create rules to detect command injection patterns in GoClaw logs.

Why prioritize this

This vulnerability scores HIGH (CVSS 7.3) with remote exploitation, no authentication requirement, and public exploit availability. It directly enables unauthenticated remote code execution on affected systems. The pending patch status means no immediate official fix is available, increasing organizational risk if vulnerable versions remain in production. Any internet-facing or untrusted-input-processing GoClaw deployment should be remediated urgently.

Risk score, explained

The CVSS 3.1 score of 7.3 reflects a HIGH severity because the attack vector is network-based, attack complexity is low, no privileges or user interaction are required, and the impact on confidentiality, integrity, and availability is low to moderate at the process level. The score does not assume full system compromise, but the technical nature of OS command injection means total system compromise is a plausible worst-case scenario depending on GoClaw's privileges and environment.

Frequently asked questions