CVE-2017-16616: Unsafe pyyaml load usage in PyAnyAPI
Summary
CVE-2017-16616: Unsafe pyyaml load usage in PyAnyAPI. Affects pyanyapi versions < 0.6.1. Fixed in 0.6.1. How to fix ↓
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Background
PyAnyAPI is a Python package available on PyPI that provides an interface for working with various APIs. It allows users to interact with APIs using a unified interface, simplifying the process of making API requests. The package includes functionality for parsing YAML data, which is a popular data serialization format. However, a vulnerability exists in the YAML parsing functionality of PyAnyAPI versions prior to 0.6.1, which can lead to arbitrary command execution.
Vulnerability Detail
The vulnerability in PyAnyAPI arises from the improper usage of the load function from the pyyaml library. Instead of using the safer safe_load function, the vulnerable code uses load, which allows for the execution of arbitrary Python commands. An attacker can exploit this vulnerability by inserting malicious Python code into loaded YAML data, leading to the execution of arbitrary commands on the system. This can result in various consequences, including unauthorized access, data manipulation, or even complete system compromise.
How To Fix
Latest published version: 0.6.1 as of 23 Oct 2026
pip install --upgrade "pyanyapi==0.6.1"The newest release already contains this fix.
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Workaround
As a workaround, users can manually modify the vulnerable code in the PyAnyAPI package to replace the usage of load with safe_load. Here is an example of the code change:
Before:
# Vulnerable code
import yaml
yaml_data = yaml.load(yaml_string)
After:
# Patched code
import yaml
yaml_data = yaml.safe_load(yaml_string)
Conclusion
The vulnerability in PyAnyAPI versions prior to 0.6.1 allows for the execution of arbitrary Python commands through the improper usage of the load function. Users should update their PyAnyAPI installation to version 0.6.1 or later to mitigate this vulnerability. Alternatively, a workaround is available by manually modifying the vulnerable code. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
PyAnyAPI is a Python package that provides a unified interface for working with various APIs. It simplifies the process of making API requests and includes functionality for parsing YAML data.
YAML is a human-readable data serialization format. It is commonly used for configuration files and data exchange between systems.
The vulnerability in PyAnyAPI occurs due to the improper usage of the load function from the pyyaml library. This function allows for the execution of arbitrary Python commands, which can be triggered by inserting malicious code into loaded YAML data.
The potential consequences of this vulnerability include unauthorized access, data manipulation, and complete system compromise. An attacker can execute arbitrary commands on the system by exploiting the vulnerability.
To fix this vulnerability, update your PyAnyAPI installation to version 0.6.1 or later. This version includes a patch that replaces the vulnerable code with safer alternatives.
