Arbitrary Java Execution Vulnerability in JinJava by HubSpot
CVE-2026-25526
Key Information:
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What is CVE-2026-25526?
JinJava, a template engine based on Django syntax for rendering Jinja templates, is susceptible to an arbitrary Java execution vulnerability via a bypass through the ForTag element. This flaw enables attackers to instantiate Java classes and access files, circumventing key sandbox restrictions. The vulnerability affects versions prior to 2.7.6 and 2.8.3. Updates have been released to mitigate this risk.
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Affected Version(s)
jinjava < 2.7.6 < 2.7.6
jinjava < 2.8.3 < 2.8.3
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.