# CVE-2019-10906: PYSEC-2019-217 - In Pallets Jinja before 2.10.1, str.format_map allows a sandbox escape.

Source: https://junglewise.ai/threats/cve-2019-10906-jinja2-sandbox-escape-via-string-formatting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2019-04-07  
License: CC BY 4.0 with a link back

CVE-2019-10906 · Severity: low · CVSS 3 · Published 2019-04-07

In Pallets Jinja before 2.10.1, str.format_map allows a sandbox escape.

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

## Quick answers

**Is CVE-2019-10906 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-10906 being exploited in the wild.

**How severe is CVE-2019-10906?** Low severity, with a CVSS score of 3, published 7 April 2019.

**Which products and versions are affected?** jinja2 (PyPI) ECOSYSTEM:introduced=0,fixed=2.10.1.

**Is there a fix for CVE-2019-10906?** Yes. jinja2 (PyPI): upgrade to 2.10.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2019-10906?** 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 2.10.1 or later

  ```sh
  pip install "jinja2>=2.10.1"
  ```


## Affected products

- jinja2 (PyPI) ECOSYSTEM:introduced=0,fixed=2.10.1

## Identifiers

- CVE-2019-10906
- GHSA-462w-v97r-4m45
- PYSEC-2019-217

## Related threats

- [PYSEC-2026-1471 - Jinja2 vulnerable to sandbox breakout through attr filter selecting format method](https://junglewise.ai/threats/cve-2025-27516-jinja2-vulnerable-to-sandbox-breakout-through-attr-filter)
- [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)