Critical severity · published Feb 4, 2026
CVE-2026-25526
JinJava Bypass through ForTag leads to Arbitrary Java Execution
9.8
CVSS
1%
EPSS
No
On KEV
Description
JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Prior to versions 2.7.6 and 2.8.3, JinJava is vulnerable to arbitrary Java execution via bypass through ForTag. This allows arbitrary Java class instantiation and file access bypassing built-in sandbox restrictions. This issue has been patched in versions 2.7.6 and 2.8.3.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JI
jinjava · HubSpot
< 2.7.6; < 2.8.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25526
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25526
Patch
https://github.com/HubSpot/jinjava/commit/3d02e504d8bbb13bf3fe019e9ca7b51dfce7a998
Patch
https://github.com/HubSpot/jinjava/commit/c7328dce6030ac718f88974196035edafef24441
Product
https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.7.6
Product
https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.8.3
Patch
https://github.com/HubSpot/jinjava/security/advisories/GHSA-gjx9-j8f8-7j74
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CVE-2025-59340
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6.5
CVE-2020-12668
Jinjava before 2.5.4 allow access to arbitrary classes by calling Java methods on objects passed into a Jinjava context
5.3
CVE-2018-18893
Jinjava before 2.4.6 does not block the getClass method, related to com/hubspot/jinjava/el/ext/JinjavaBeanELResolver.java