En resumen
- CVE-2025-27516 es una vulnerabilidad ALTO (CVSS 8.8) que afecta a jinja2, jinja (palletsprojects).
- Probabilidad de explotación en los próximos 30 días (EPSS): 0.51%, mayor que el 43.3% de las vulnerabilidades.
- Solución: actualizar a 3.1.6 o posterior.
| Package | Affected versions | Patched versions |
|---|
| jinja2 PyPI | < 3.1.6
| 3.1.6
|
| jinja | < 3.1.6
| 3.1.6
|
Description
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.
NVD description
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.
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