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CVE-2025-27516— Jinja sandbox breakout through attr filter selecting format method

Quick assessment

Affected
pallets jinja
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jinja是Pallets开源的一个快速、富有表现力且可扩展的模板引擎。 Jinja 3.1.6之前版本存在安全漏洞，该漏洞源于属性过滤器绕过沙箱，导致执行任意代码。

AI Predicted 6.2 Difficulty: Moderate EPSS 0.51% · P41
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I. Basic Information for CVE-2025-27516

Vulnerability Information
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Vulnerability Title
Jinja sandbox breakout through attr filter selecting format method
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
Jinja 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jinja是Pallets开源的一个快速、富有表现力且可扩展的模板引擎。 Jinja 3.1.6之前版本存在安全漏洞，该漏洞源于属性过滤器绕过沙箱，导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pallets jinja < 3.1.6 -

II. Public POCs for CVE-2025-27516

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III. Intelligence Information for CVE-2025-27516

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Patches & Fixes for CVE-2025-27516 (1)

Vendor Advisories for CVE-2025-27516 (1)

IV. Related Vulnerabilities

Same product: jinja
Same vendor: pallets
Same weakness: CWE-1336

V. Comments for CVE-2025-27516

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