HubSpot jinjava up to 2.8.0 Jinja Template mapper.getTypeFactory.constructFromCanonical special elements used in a template engine

Summaryinfo

A vulnerability classified as critical was found in HubSpot jinjava up to 2.8.0. This affects the function mapper.getTypeFactory.constructFromCanonical of the component Jinja Template Handler. The manipulation results in improper neutralization of special elements used in a template engine. This vulnerability is cataloged as CVE-2025-59340. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in HubSpot jinjava up to 2.8.0. It has been classified as critical. Affected is the function mapper.getTypeFactory.constructFromCanonical of the component Jinja Template Handler. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-59340 since 09/12/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1221.

Upgrading to version 2.8.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 66df351e7e8ad71ca04dcacb4b65782af820b8b1 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Programming Language Software

Vendor

• HubSpot

Name

• jinjava

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8.0

License

• open-source

Website

• Product: https://github.com/HubSpot/jinjava/

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