What is the CVSS score of CVE-2026-25526?

CVE-2026-25526 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Java are affected by CVE-2026-25526?

A critical vulnerability in JinJava (CVSS 9.8) allows attackers to execute arbitrary Java code on systems using affected versions, potentially compromising application integrity and sensitive data.. A patch is available.

How to fix or mitigate CVE-2026-25526?

Within 24 hours: identify all systems running JinJava and determine which versions are deployed; isolate or restrict network access to affected applications if immediate patching is not feasible. Within 7 days: apply vendor patches (upgrade to JinJava 2.7.6 or 2.8.3 or later) to all affected systems and validate patches in a test environment first. Within 30 days: complete patch deployment across production environments, conduct vulnerability rescans to confirm remediation, and review application logs for evidence of exploitation attempts.

Java CVE-2026-25526

CRITICAL

Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336)

2026-02-04 security-advisories@github.com

GHSA-gjx9-j8f8-7j74

Java Golang Django Jinjava

9.8

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

Patch released

Feb 20, 2026 - 21:00 nvd

Patch available

CVE Published

Feb 04, 2026 - 22:15 nvd

CRITICAL 9.8

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

14 maven packages depend on com.hubspot.jinjava:jinjava (6 direct, 8 indirect)

Ecosystem-wide dependent count for version 2.8.0.

DescriptionNVD

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.

AnalysisAI

JinJava template engine has a server-side template injection vulnerability enabling arbitrary code execution through crafted Jinja-style templates.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Craft malicious Jinja template with ForTag

Exploit

Bypass sandbox restrictions

Execution

Instantiate arbitrary Java classes

Impact

Execute arbitrary code

Access

Craft malicious Jinja template with ForTag

Exploit

Bypass sandbox restrictions

Execution

Instantiate arbitrary Java classes

Impact

Execute arbitrary code

Vulnerability AssessmentAI

Exploitation	JinJava versions prior to 2.7.6 and 2.8.3 processing untrusted template input. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 9.8 with patch. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker injects Jinja template syntax (e.g., {{request.class.forName('java.lang.Runtime')}}) into user input that gets rendered by JinJava, achieving Java code execution.
Remediation	Update JinJava. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: identify all systems running JinJava and determine which versions are deployed; isolate or restrict network access to affected applications if immediate patching is not feasible. …

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-25526 vulnerability details – vuln.today

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Java CVE-2026-25526

CVSS VectorNVD

Lifecycle Timeline

Blast Radius

DescriptionNVD

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

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External POC / Exploit Code