CVE-2025-59340
9.8 · CRITICALOverview
CVE-2025-59340 is a critical-severity vulnerability affecting hubspot jinjava. It was published on September 17, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from hubspot. Update jinjava to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| hubspot | jinjava | >= 0, < 2.8.1 | Affected |
Frequently Asked Questions
What is CVE-2025-59340?
CVE-2025-59340 is a critical-severity vulnerability affecting hubspot jinjava. It was published on September 17, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2025-59340?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-59340?
Check the references section for vendor advisories and patches from hubspot. Update jinjava to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-59340?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-59340 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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