Vulnerability · Published Sep 17, 2025 · Assigned by GitHub_M
CVE-2025-59340jinjava Sandbox Bypass via JavaType-Based Deserialization
Critical 9.8
In plain English
A critical-severity security flaw in jinjava from HubSpot. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 82% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | com.hubspot.jinjava:jinjava | 2.8.1 | GHSA-m49c-g9wr-hv6v |
| Maven | com.hubspot.jinjava:jinjava | 2.7.5 | GHSA-m49c-g9wr-hv6v |
Affected products (as reported)
Weakness: CWE-1336 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H