Vulnerability Description
jinjava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Priori to 2.8.1, by using mapper.getTypeFactory().constructFromCanonical(), it is possible to instruct the underlying ObjectMapper to deserialize attacker-controlled input into arbitrary classes. This enables the creation of semi-arbitrary class instances without directly invoking restricted methods or class literals. As a result, an attacker can escape the sandbox and instantiate classes such as java.net.URL, opening up the ability to access local files and URLs(e.g., file:///etc/passwd). With further chaining, this primitive can potentially lead to remote code execution (RCE). This vulnerability is fixed in 2.8.1.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hubspot | Jinjava | < 2.8.1 |
Related Weaknesses (CWE)
References
- https://github.com/HubSpot/jinjava/commit/66df351e7e8ad71ca04dcacb4b65782af820b8Patch
- https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.8.1Release Notes
- https://github.com/HubSpot/jinjava/security/advisories/GHSA-m49c-g9wr-hv6vVendor Advisory
FAQ
What is CVE-2025-59340?
CVE-2025-59340 is a vulnerability with a CVSS score of 9.8 (CRITICAL). jinjava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Priori to 2.8.1, by using mapper.getTypeFactory().constructFromCanonical(), it is possible t...
How severe is CVE-2025-59340?
CVE-2025-59340 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-59340?
Check the references section above for vendor advisories and patch information. Affected products include: Hubspot Jinjava.