# CVE-2025-59340

## Summary

- **CVE ID:** CVE-2025-59340
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-1336
- **Published:** Sep 17, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- HubSpot — jinjava (< 2.8.1)

## References

- [CNA](https://github.com/HubSpot/jinjava/security/advisories/GHSA-m49c-g9wr-hv6v)
- [CNA](https://github.com/HubSpot/jinjava/commit/66df351e7e8ad71ca04dcacb4b65782af820b8b1)
- [CNA](https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.8.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 2.11%
- **EPSS Percentile:** 80.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._