CVE-2026-39305: PraisonAI Path Traversal Vulnerability

CVE-2026-39305 Overview

CVE-2026-39305 is a Path Traversal vulnerability affecting PraisonAI, a multi-agent teams system. The vulnerability exists in the Action Orchestrator feature and allows an attacker or compromised agent to write to arbitrary files outside of the configured workspace directory. By supplying relative path segments (../) in the target path, malicious actions can overwrite sensitive system files or drop executable payloads on the host system.

Critical Impact

This vulnerability enables arbitrary file write operations outside the intended workspace, potentially allowing attackers to overwrite critical system files, deploy malicious payloads, or achieve code execution on the host system.

Affected Products

• PraisonAI versions prior to 1.5.113

Discovery Timeline

• 2026-04-07 - CVE CVE-2026-39305 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-39305

Vulnerability Analysis

This Path Traversal vulnerability (CWE-22) occurs in the Action Orchestrator component of PraisonAI. The vulnerability arises from insufficient validation of file paths when the system processes actions that involve file operations. When an agent or user submits a target path for file write operations, the application fails to properly sanitize or validate the path, allowing directory traversal sequences to escape the designated workspace sandbox.

The local attack vector means an attacker needs some level of access to interact with the PraisonAI system, either directly or through a compromised agent. The changed scope indicates that successful exploitation can impact resources beyond the vulnerable component's security authority, affecting the underlying host system's integrity and availability.

Root Cause

The root cause is improper input validation in the Action Orchestrator's file path handling mechanism. The application does not adequately sanitize user-supplied path inputs, failing to strip or reject directory traversal sequences such as ../ before performing file write operations. This allows path manipulation to escape the configured workspace directory boundary and access arbitrary locations on the filesystem.

Attack Vector

An attacker can exploit this vulnerability by crafting malicious file paths containing relative path traversal sequences when interacting with the Action Orchestrator feature. The attack flow involves:

1. An attacker or compromised agent initiates a file write action through the Action Orchestrator
2. The attacker supplies a malicious path containing ../ sequences (e.g., ../../../etc/cron.d/malicious or ../../../home/user/.bashrc)
3. The application fails to validate and sanitize the path, allowing the write operation to escape the workspace
4. The malicious content is written to an arbitrary location on the filesystem, potentially overwriting system files or placing executable payloads

For technical details on the exploitation mechanism, refer to the GitHub Security Advisory.

Detection Methods for CVE-2026-39305

Indicators of Compromise

• File write operations from PraisonAI processes to locations outside the configured workspace directory
• Presence of unexpected files in system directories that were created or modified around PraisonAI activity timeframes
• Log entries showing path traversal patterns (../) in file operation requests to the Action Orchestrator
• Unusual cron jobs, startup scripts, or configuration file modifications on systems running PraisonAI

Detection Strategies

• Monitor file system activity from PraisonAI processes for writes outside the designated workspace directory
• Implement file integrity monitoring (FIM) on critical system directories to detect unauthorized modifications
• Review PraisonAI application logs for path traversal patterns in action requests
• Deploy endpoint detection solutions to identify suspicious file creation patterns originating from AI agent processes

Monitoring Recommendations

• Enable detailed logging for all Action Orchestrator file operations
• Configure alerts for any file operations containing directory traversal sequences
• Monitor system directories for unexpected file creations or modifications during PraisonAI runtime
• Implement application-level logging to capture the full path of all file write requests

How to Mitigate CVE-2026-39305

Immediate Actions Required

• Upgrade PraisonAI to version 1.5.113 or later immediately
• Audit systems running vulnerable versions for signs of exploitation or unauthorized file modifications
• Review file integrity of critical system directories on affected hosts
• Implement network segmentation to limit the impact of potentially compromised AI agent systems

Patch Information

The vulnerability has been fixed in PraisonAI version 1.5.113. Organizations should upgrade to this version or later to remediate the vulnerability. The fix implements proper path validation and sanitization in the Action Orchestrator to prevent directory traversal attacks. For additional details, see the GitHub Security Advisory.

Workarounds

• Restrict the permissions of the user account running PraisonAI to limit the scope of potential file writes
• Implement filesystem access controls (chroot, containers, or sandboxing) to confine PraisonAI to its workspace directory
• Deploy a web application firewall or input validation layer to filter path traversal sequences before they reach the application
• Run PraisonAI in an isolated environment with minimal filesystem access to reduce the impact of exploitation

# Example: Run PraisonAI in a restricted container environment
# This limits filesystem access to designated volumes only
docker run --read-only \
  --tmpfs /tmp \
  -v /app/workspace:/workspace:rw \
  --security-opt no-new-privileges \
  praisonai:1.5.113