jinjava Sandbox Bypass via JavaType-Based Deserialization_CVE-2025-59340

9.8 / 10

CRITICAL

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

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.

Basic Information

ID CVE-2025-59340

Source GitHub_M

Published Sep 17, 2025 at 20:01

Affected Product

Vendor HubSpot

Product jinjava

Version < 2.8.1

Affected Versions HubSpot jinjava < 2.8.1

CWE Classification

CWE-1336

References

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