GHSA-cpwx-vrp4-4pq7

Suggest an improvement
Source
https://github.com/advisories/GHSA-cpwx-vrp4-4pq7
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-cpwx-vrp4-4pq7/GHSA-cpwx-vrp4-4pq7.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-cpwx-vrp4-4pq7
Aliases
Related
Published
2025-03-05T20:40:14Z
Modified
2025-03-05T22:10:11.248005Z
Severity
  • 5.4 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
Jinja2 vulnerable to sandbox breakout through attr filter selecting format method
Details

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.

Database specific 
{
    "nvd_published_at": "2025-03-05T21:15:20Z",
    "cwe_ids": [
        "CWE-1336"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-05T20:40:14Z"
}
References

Affected packages

PyPI / jinja2

Package

Name
jinja2
View open source insights on deps.dev
Purl
pkg:pypi/jinja2

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.1.6

Affected versions

2.*

2.0rc1
2.0
2.1
2.1.1
2.2
2.2.1
2.3
2.3.1
2.4
2.4.1
2.5
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
2.6
2.7
2.7.1
2.7.2
2.7.3
2.8
2.8.1
2.9
2.9.1
2.9.2
2.9.3
2.9.4
2.9.5
2.9.6
2.10
2.10.1
2.10.2
2.10.3
2.11.0
2.11.1
2.11.2
2.11.3

3.*

3.0.0a1
3.0.0rc1
3.0.0rc2
3.0.0
3.0.1
3.0.2
3.0.3
3.1.0
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5

Database specific 

{
    "last_known_affected_version_range": "<= 3.1.5"
}