CVE-2025-27516

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.

Affected products

Alt Linux, Almalinux, Astra Linux, Centos, Debian, Jinja, Linuxmint, Red Hat

Palletsprojects Jinja

< 3.1.6

Fix

Available

CVSS 3.1

8.8 HIGH

EPSS

0.5% (40th percentile)

Weakness

CWE-1336

NVD status

Modified

Published

2025-03-05

No exploit for CVE-2025-27516 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.