CVE-2026-59807: Composio SDK Path Validation Bypass – Credential Exfiltration Risk

Technical summary

CVE-2026-59807 is a path validation bypass in the readFileFromDisk function within tool-file-uploads.ts of Composio SDK. The root cause is the absence of an assertSafeFileUploadPath validation check that should restrict file operations to safe directories. Attackers exploit prompt injection to manipulate the file_uploadable parameter, enabling arbitrary file reads from the host filesystem. Once read, the SDK's file upload mechanism exfiltrates sensitive data to attacker-controlled endpoints. The vulnerability is classified under CWE-73 (External Control of File Name or Path), a well-known pattern in file handling logic flaws.

Business impact

Organizations using Composio SDK in production risk exposure of sensitive credentials and configuration files. SSH private keys, database credentials, API tokens, and other secrets stored on the same system as the SDK become accessible to remote attackers. This can lead to lateral movement, unauthorized infrastructure access, and downstream compromise of connected systems. The impact is particularly acute in CI/CD pipelines, development environments, and edge deployments where the SDK may process LLM-generated or user-supplied prompts without rigorous filtering.

Affected systems

Composio SDK versions prior to 0.2.32-beta.283 are affected. The vulnerability targets deployments where the SDK's file upload functionality is exposed to untrusted input—whether from language model outputs, user-supplied prompts, or integrated AI agents. Any system running an affected version and accepting external prompt or parameter input is at risk. Verify your installed version against the fixed release and assess whether your SDK deployment processes potentially adversarial input.

Exploitability

Exploitability is moderate to high in realistic scenarios. The attack requires no authentication and can be executed remotely over the network. However, the attacker must successfully craft a prompt injection payload that manipulates SDK parameters—a non-trivial but well-understood technique in LLM security. The absence of a fix in current mainstream releases means any unpatched deployment remains vulnerable. Public awareness of prompt injection attacks and file exfiltration patterns makes exploitation increasingly likely if systems remain unpatched.

Remediation

Upgrade Composio SDK to version 0.2.32-beta.283 or later. This release restores the assertSafeFileUploadPath validation to block unauthorized file access. After patching, audit your SDK deployment for any file operations that may have occurred during the vulnerable window, particularly any unusual outbound uploads or credential access. Implement network-level controls to restrict outbound connections from SDK processes to trusted endpoints only, and apply input validation and prompt sanitization upstream of the SDK.

Patch guidance

Update Composio SDK via your package manager to 0.2.32-beta.283 or any later stable release. For npm environments, run 'npm install [email protected]' or update your package.json dependency. For other package managers, verify the version number in the official repository before installing. Once updated, restart any services or applications that depend on the SDK. Test the file upload functionality in a non-production environment first to confirm the patch does not break existing workflows. If you are on a pinned version, work with your development team to schedule the upgrade on your release cycle.

Detection guidance

Monitor for suspicious file read patterns in your SDK logs and host system audit logs. Look for readFileFromDisk calls accessing paths outside expected directories—particularly /root/.ssh, /home/*/.ssh, /etc/passwd, or similar sensitive paths. Check for unusual outbound connections from SDK processes to unfamiliar IP addresses or domains, especially on non-standard ports. Network intrusion detection can alert on exfiltration of credential-like data patterns. Enable verbose logging on the SDK to capture file operation parameters and review for malicious file_uploadable values that attempt path traversal (../ sequences, absolute paths to sensitive locations).

Why prioritize this

Although the CVSS score is 6.8 (Medium), the practical risk warrants prompt attention. The vulnerability enables direct exfiltration of secrets without requiring user interaction, affects a widely-used SDK in AI/LLM pipelines, and the fix is straightforward. Organizations should prioritize this patch within their standard maintenance windows—ideally within 2–4 weeks. Delay increases the window of exposure for credential theft and downstream infrastructure compromise.

Risk score, explained

The CVSS 3.1 score of 6.8 (Medium) reflects high confidentiality impact (C:H) but no integrity or availability risk. The network attack vector (AV:N) and lack of privilege or user interaction requirements (PR:N/UI:N) increase severity, but the high complexity (AC:H) of successful prompt injection reduces the score. The changed scope (S:C) indicates the impact can affect systems beyond the vulnerable component. In context, this is a legitimate Medium risk; however, organizations handling highly sensitive infrastructure secrets should treat it as a higher operational priority despite the formal CVSS rating.

Frequently asked questions