CVE-2016-10745: Jinja2 - Sandbox Escape
Summary
CVE-2016-10745: Jinja2 sandbox escape vulnerability. Affects jinja2 versions < 2.8.1. Fixed in 2.8.1. How to fix ↓
Also tracked for
- jinja2 · Debian:11
The same CVE-2016-10745 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
Jinja2 is a popular templating engine for Python. It provides a powerful and flexible way to generate dynamic HTML, XML, or other markup formats. Jinja2 is widely used in web development frameworks and applications to separate the presentation layer from the business logic. However, Jinja2 versions before 2.8.1 are vulnerable to a high severity issue that allows a sandbox escape.
Vulnerability Detail
The vulnerability in Jinja2 (CVE-2016-10745) arises from a flaw in the str.format function. This function, when used in a sandboxed environment, can be exploited to break out of the sandbox and execute arbitrary code. An attacker with the ability to control the format string can craft a payload that bypasses the intended restrictions and gains unauthorized access to sensitive resources or performs malicious actions. This vulnerability has a CVSS score of 8.6, indicating a high severity level.
How To Fix
Latest published version: 3.1.6 as of 23 Oct 2026
pip install --upgrade "jinja2==3.1.6"Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
2.8.1
This is the first release that contains the fix.
pip install --upgrade "jinja2==2.8.1"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is crucial to apply the recommended fix by upgrading to Jinja2 version 2.8.1 or later.
Conclusion
In conclusion, the Jinja2 vulnerability (CVE-2016-10745) allows a sandbox escape, enabling attackers to execute arbitrary code. It is crucial to upgrade to Jinja2 version 2.8.1 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for jinja2 →
FAQ
Jinja2 is a templating engine for Python that allows developers to generate dynamic HTML, XML, or other markup formats. It is widely used in web development frameworks and applications.
This vulnerability allows an attacker to escape the sandbox and execute arbitrary code. It can lead to unauthorized access to sensitive resources or the execution of malicious actions.
The CVSS score of this vulnerability is 8.6, indicating a high severity level.
No, there is no known workaround for this vulnerability. It is essential to upgrade to Jinja2 version 2.8.1 or later.
To fix this vulnerability, you need to upgrade Jinja2 to version 2.8.1 or later. Make sure to update your dependencies and use the updated version in your projects.
Related vulnerabilities
Recent vulnerabilities recorded for jinja2.
