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CVE-2025-49619: Jinja Runtime Leak Vulnerability in Skyvern

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Overview

The CVE-2025-49619 is a significant cybersecurity vulnerability that affects Skyvern up to version 0.1.85. The vulnerability lies within the Jinja runtime leak located in the sdk/workflow/models/block.py component of the software. This vulnerability matters greatly because it can potentially lead to system compromise and data leakage if exploited by malicious actors. Companies depending on Skyvern software, particularly those dealing with sensitive data, should be aware of this vulnerability and take immediate steps to mitigate the risk.

Vulnerability Summary

CVE ID: CVE-2025-49619
Severity: High 8.5 (CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Skyvern | Up to 0.1.85

How the Exploit Works

The exploit takes advantage of the Jinja runtime leak in the sdk/workflow/models/block.py component, which allows an attacker to inject malicious code into the application. This code could potentially lead to unauthorized access to the system and its data. The vulnerability occurs due to improper validation of user-supplied input within the affected software.

Conceptual Example Code

Here’s a conceptual example of how this vulnerability might be exploited.

from jinja2 import Environment, select_autoescape
# Establishing the Jinja environment
env = Environment(autoescape=select_autoescape(['html', 'xml']))
# Loading the vulnerable template
template = env.get_template('sdk/workflow/models/block.py')
# Injecting malicious payload
malicious_payload = "{% for item in [7,3,2,1] %}{{ item }}{% endfor %}"
rendered_template = template.render(malicious_payload=malicious_payload)
print(rendered_template)

This example Python code snippet demonstrates how an attacker could use Jinja template injection to execute arbitrary Python code within the application’s context, leading to system compromise or data leakage.

How to Mitigate the Vulnerability

To mitigate the impact of this vulnerability, users and administrators are recommended to apply the vendor patch as soon as it becomes available. Until then, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as a temporary mitigation measure. These systems can help detect and block potential exploits. However, they should not be relied upon as a permanent solution.

Note
: This post is intended for educational purposes only. It does not condone or promote malicious activities. Always practice ethical hacking.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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