CVE-2024-56326

Description

Jinja is an extensible templating engine. Prior to 3.1.5, An oversight in how the Jinja sandboxed environment detects calls to str.format 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 store a reference to a malicious string's format method, then pass that to a filter that calls it. No such filters are built-in to Jinja, but could be present through custom filters in an application. After the fix, such indirect calls are also handled by the sandbox. This vulnerability is fixed in 3.1.5.

CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-693 CWE-693

CWE-1336 CWE-1336

Affected Products

Vendor	Product	Versions
palletsprojects	jinja	< 3.1.5

References

Advisories & Patches

https://github.com/pallets/jinja/commit/48b0687e05a5466a91cd5812d604fa37ad0943b4 https://github.com/pallets/jinja/security/advisories/GHSA-q2x7-8rv6-6q7h

Other References

https://github.com/pallets/jinja/releases/tag/3.1.5 https://lists.debian.org/debian-lts-announce/2025/04/msg00022.html

Frequently Asked Questions

What is CVE-2024-56326? +

Jinja is an extensible templating engine. Prior to 3.1.5, An oversight in how the Jinja sandboxed environment detects calls to str.format 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 store a reference to a malicious string's format method, then pass that to a filter that calls it. No such filters are built-in to Jinja, but could be present through custom filters in an application. After the fix, such indirect calls are also handled by the sandbox. This vulnerability is fixed in 3.1.5. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-56326? +

CVE-2024-56326 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-56326? +

CVE-2024-56326 affects products from palletsprojects, specifically: jinja. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-56326? +

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.

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