Arbitrary Java Execution Vulnerability in JinJava by HubSpot
CVE-2026-25526

9.8CRITICAL

Key Information:

Vendor

Hubspot

Status
Jinjava
Vendor
CVE Published:
4 February 2026

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

References

https://github.com/HubSpot/jinjava/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/HubSpot/jinjava/commit/3d02e504d8bbb13...
x_refsource_MISC
https://github.com/HubSpot/jinjava/commit/c7328dce6030ac7...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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