# CVE-2025-27516: PYSEC-2026-1471 - Jinja2 vulnerable to sandbox breakout through attr filter selecting format method

Source: https://junglewise.ai/threats/cve-2025-27516-jinja2-vulnerable-to-sandbox-breakout-through-attr-filter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-07  
License: CC BY 4.0 with a link back

CVE-2025-27516 · Severity: medium · CVSS 4 · Published 2026-07-07

Jinja2 vulnerable to sandbox breakout through attr filter selecting format method

Technologies: [jinja2 (PyPI)](https://junglewise.ai/threats/technologies/jinja2). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-27516 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-27516 being exploited in the wild.

**How severe is CVE-2025-27516?** Medium severity, with a CVSS score of 4, published 7 July 2026.

**Which products and versions are affected?** jinja2 (PyPI) ECOSYSTEM:introduced=0,fixed=3.1.6.

**Is there a fix for CVE-2025-27516?** Yes. jinja2 (PyPI): upgrade to 3.1.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-27516?** Check whether you run jinja2 (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- jinja2 (PyPI): upgrade to 3.1.6 or later

  ```sh
  pip install "jinja2>=3.1.6"
  ```


## Affected products

- jinja2 (PyPI) ECOSYSTEM:introduced=0,fixed=3.1.6

## Identifiers

- CVE-2025-27516
- GHSA-cpwx-vrp4-4pq7
- PYSEC-2026-1471

## Related threats

- [PYSEC-2026-1475 - Jinja has a sandbox breakout through indirect reference to format method](https://junglewise.ai/threats/cve-2024-56326-jinja-has-a-sandbox-breakout-through-indirect-reference-to-format)
- [PYSEC-2026-1472 - Jinja has a sandbox breakout through malicious filenames](https://junglewise.ai/threats/cve-2024-56201-jinja-has-a-sandbox-breakout-through-malicious-filenames)
- [PYSEC-2026-1474 - Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter](https://junglewise.ai/threats/cve-2024-34064-jinja-vulnerable-to-html-attribute-injection-when-passing-user)
- [PYSEC-2026-1473 - Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter](https://junglewise.ai/threats/cve-2024-22195-jinja-vulnerable-to-html-attribute-injection-when-passing-user)
- [Nautobot secrets exposure and data manipulation via Jinja2 templating](https://junglewise.ai/threats/cve-2025-49142-nautobot-secrets-exposure-and-data-manipulation-via-jinja2)