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.
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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. | |
Title | jinjava Sandbox Bypass via JavaType-Based Deserialization | |
Weaknesses | CWE-1336 | |
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-09-17T20:01:55.788Z
Updated: 2025-09-18T15:45:23.121Z
Reserved: 2025-09-12T12:36:24.635Z
Link: CVE-2025-59340

Updated: 2025-09-18T15:45:20.541Z

Status : Awaiting Analysis
Published: 2025-09-17T20:15:36.430
Modified: 2025-09-18T13:43:34.310
Link: CVE-2025-59340

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