Vulnerability in Hubspot Jinjava
CVE-2026-25526
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000
Affected products
- Hubspot Jinjava — versions < 2.7.6, < 2.8.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/HubSpot/jinjava/security/advisories/GHSA-gjx9-j8f8-7j74 (Patch, Vendor Advisory)
- github.com/HubSpot/jinjava/commit/3d02e504d8bbb13bf3fe019e9ca7b51dfce7a998 (Patch)
- github.com/HubSpot/jinjava/commit/c7328dce6030ac718f88974196035edafef24441 (Patch)
- github.com/HubSpot/jinjava/releases/tag/jinjava-2.7.6 (Product, Release Notes)
- github.com/HubSpot/jinjava/releases/tag/jinjava-2.8.3 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-25526?
- CVE-2026-25526 is a critical-severity vulnerability in Hubspot Jinjava, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 9.8/10. Published 2026-02-04.
- How severe is CVE-2026-25526?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-25526 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.