CVE-2024-56201: Jinja has a sandbox breakout through malicious filenames

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-23 · updated 2026-06-17
Weakness: CWE-150

Description

Jinja is an extensible templating engine. In versions on the 3.x branch prior to 3.1.5, a bug in the Jinja compiler allows an attacker that controls both the content and filename of a template to execute arbitrary Python code, regardless of if Jinja's sandbox is used. To exploit the vulnerability, an attacker needs to control both the filename and the contents 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 where the template author can also choose the template filename. This vulnerability is fixed in 3.1.5.

Affected products

pallets jinja: from 3.0.0 before 3.1.5 — fixed in 3.1.5
Pypi Jinja2: from 3.0.0 before 3.1.5; 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.0, 3.1.1 (+3) — fixed in 3.1.5

How to fix

Upgrade to a fixed version: pallets jinja 3.1.5; Pypi Jinja2 3.1.5. Check the vendor advisory for mitigations.

References

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