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CVE-2025-59340— jinjava Sandbox Bypass via JavaType-Based Deserialization

Quick assessment

Affected
HubSpot jinjava
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HubSpot Jinjava是美国HubSpotn个人开发者的一个应用软件。提供基于Java的模板模板引擎，基于Django模板语法，适用于呈现jinja模板。 HubSpot Jinjava 2.8.1之前版本存在安全漏洞，该漏洞源于允许反序列化攻击者控制的输入，可能导致沙箱逃逸和远程代码执行。

CVSS 9.8 · Critical EPSS 2.11% · P81
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I. Basic Information for CVE-2025-59340

Vulnerability Information
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Vulnerability Title
jinjava Sandbox Bypass via JavaType-Based Deserialization
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
HubSpot Jinjava 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HubSpot Jinjava是美国HubSpotn个人开发者的一个应用软件。提供基于Java的模板模板引擎，基于Django模板语法，适用于呈现jinja模板。 HubSpot Jinjava 2.8.1之前版本存在安全漏洞，该漏洞源于允许反序列化攻击者控制的输入，可能导致沙箱逃逸和远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
HubSpot jinjava < 2.8.1 -

II. Public POCs for CVE-2025-59340

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 11279 chars
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III. Intelligence Information for CVE-2025-59340

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Vendor Advisories for CVE-2025-59340 (1)

IV. Related Vulnerabilities

Same product: jinjava
Same vendor: HubSpot
Same weakness: CWE-1336

V. Comments for CVE-2025-59340

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