CVE-2026-57284: Jenkins Pipeline Groovy Plugin Vulnerable To Unrestricted Vulnerability
MODERATECVE-2026-57284 is a MODERATE (CVSS 4.3) groovy plugin vulnerable to unrestricted vulnerability (CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')) affecting Jenkins Pipeline libraries in the Maven ecosystem. The issue involves groovy plugin vulnerable to unrestricted instantiation of types. Remediation is available by upgrading affected packages to version 4331.4333.
CVE-2026-57284 at a Glance
Security Impact
CVSS: 4.3
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).
How to Fix CVE-2026-57284
To remediate this vulnerability, upgrade all affected Jenkins Pipeline dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>io.jenkins.plugins</groupId>
<artifactId>pipeline-groovy-lib</artifactId>
<version>4331.4333</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=io.jenkins.pluginsHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-57284, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=io.jenkins.pluginsAnalyze the terminal output to locate any version of Jenkins Pipeline in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4331.4333), your application is affected.
Note: The mvn dependency:tree -Dincludes=io.jenkins.plugins command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection'), where the product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code. In Jenkins Pipeline, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-57284 Affected Jenkins Pipeline Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
io.jenkins.plugins:pipeline-groovy-lib
|
Maven |
< 4331.4333
|
4331.4333
|
References
Frequently Asked Questions
What is CVE-2026-57284?
Which Jenkins Pipeline versions are affected?
What version fixes CVE-2026-57284?
Is pipeline-groovy-lib affected?
What is the CVSS score of CVE-2026-57284?
What CWE is associated with CVE-2026-57284?
How can I check Maven dependencies for CVE-2026-57284?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-2w2h-gwwj-fh3q",
"modified" : "2026-09-25T18:08:12Z",
"published" : "2026-06-24T15:31:47Z",
"aliases" : [ "CVE-2026-57284" ],
"summary" : "Jenkins Pipeline: Groovy Plugin vulnerable to unrestricted instantiation of types",
"details" : "Jenkins Pipeline: Groovy Plugin 4331.v9d06ed4658ff and earlier does not restrict the types that can be instantiated through the Pipeline Snippet Generator, instantiating any type with a constructor annotated with @DataBoundConstructor in response to a request.\n\nThis allows attackers to have Pipeline: Groovy Plugin instantiate types related to job or system configuration other than Pipeline steps.\n\nAdditionally, this HTTP endpoint can be accessed using the GET method and does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability. This allows attackers to create a script approval request attributed to another user, impersonating a trusted user when social engineering an administrator into approving a malicious script.\n\nThis vulnerability has been reported through the Jenkins Bug Bounty Program sponsored by the European Commission.\nPipeline: Groovy Plugin 4331.4333.v50a_b_076c5199 only instantiates Pipeline steps and metastep delegates through the Snippet Generator, and requires POST requests for the affected HTTP endpoint.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "io.jenkins.plugins:pipeline-groovy-lib"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "4331.4333"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-57284"
}, {
"type" : "WEB",
"url" : "https://github.com/jenkinsci/workflow-cps-plugin/commit/50ab076c519907ebc0f63c8d73f37fcb81686b99"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/jenkinsci/workflow-cps-plugin"
}, {
"type" : "WEB",
"url" : "https://github.com/jenkinsci/workflow-cps-plugin/releases/tag/4331.4333.v50a_b_076c5199"
}, {
"type" : "WEB",
"url" : "https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3677"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-470" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-25T18:08:12Z",
"nvd_published_at" : "2026-06-24T14:17:34Z"
}
}