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Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to use the |attr filter to get a reference to a string's plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment's attribute lookup. This vulnerability is fixed in 3.1.6.
A very fast and expressive template engine.
Library home page: https://files.pythonhosted.org/packages/bd/0f/2ba5fbcd631e3e88689309dbe978c5769e883e4b84ebfe7da30b43275c5a/jinja2-3.1.5-py3-none-any.whl
Path to dependency file: /docs/requirements.txt
Path to vulnerable library: /docs/requirements.txt
Found in HEAD commit: 7a62fefa88af1f650238e1324ab0c46c6883f33e
Vulnerabilities
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
Vulnerable Library - jinja2-3.1.5-py3-none-any.whl
A very fast and expressive template engine.
Library home page: https://files.pythonhosted.org/packages/bd/0f/2ba5fbcd631e3e88689309dbe978c5769e883e4b84ebfe7da30b43275c5a/jinja2-3.1.5-py3-none-any.whl
Path to dependency file: /docs/requirements.txt
Path to vulnerable library: /docs/requirements.txt
Dependency Hierarchy:
Found in HEAD commit: 7a62fefa88af1f650238e1324ab0c46c6883f33e
Found in base branch: develop
Vulnerability Details
Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to use the |attr filter to get a reference to a string's plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment's attribute lookup. This vulnerability is fixed in 3.1.6.
Publish Date: 2025-03-05
URL: CVE-2025-27516
CVSS 3 Score Details (5.5)
Base Score Metrics:
Suggested Fix
Type: Upgrade version
Release Date: 2025-03-05
Fix Resolution: 3.1.6
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