CVE-2025-27516

HIGH
Published Mar 5, 2025 Modified Nov 3, 2025 CWE-1336

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.

Is your site exposed to CVE-2025-27516?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

8.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness Type (CWE)

CWE-1336 CWE-1336

Affected Products

Vendor Product
palletsprojects jinja
debian debian_linux

References

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 8.8 (HIGH).
How severe is CVE-2025-27516? +
CVE-2025-27516 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2025-27516? +
CVE-2025-27516 affects products from debian, palletsprojects, specifically: debian_linux, jinja. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-27516? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2024-58303

FoF Pretty Mail 1.1.2 contains a server-side template injection vulnerability that allows administrative users to inject malicious code into email …
CVE-2026-52762

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, YesWiki Bazar contains a stored Server-Side Template Injection …
CVE-2025-26789

An issue was discovered in Logpoint AgentX before 1.5.0. A vulnerability caused by limited access controls allowed li-admin users to …
CVE-2026-44181

Jupyter Enterprise Gateway launches remote Jupyter Notebook kernels across distributed clusters like Apache Spark, Kubernetes, and Docker Swarm. In versions …
CVE-2026-41065

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 are vulnerable to …
CVE-2026-62682

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, an unescaped backtick …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2025-27516 — free, no signup required.