CVE-2026-48921: Jenkins Pipeline Groovy Libraries Plugin Does Not Vulnerability

HIGH
Advisory Identifier: GHSA-qjq3-wqj5-g37q
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CVSS 7.5
CWE-59
Published
Advisory Summary

CVE-2026-48921 is a HIGH (CVSS 7.5) groovy libraries plugin does not vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Jenkins Pipeline libraries in the Maven ecosystem. The issue involves groovy libraries plugin does not prohibit symbolic links in shared libraries. Remediation is available by upgrading affected packages to version 798.v5cc688825312.

CVE-2026-48921 at a Glance

CVE Identifier CVE-2026-48921
GHSA Identifier GHSA-qjq3-wqj5-g37q
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-59: Improper Link Resolution Before File Access ('Link Following')
Affected Product Jenkins Pipeline
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-48921

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.

io.jenkins.plugins:pipeline-groovy-lib fixed: 798.v5cc688825312 
<dependency>
    <groupId>io.jenkins.plugins</groupId>
    <artifactId>pipeline-groovy-lib</artifactId>
    <version>798.v5cc688825312</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=io.jenkins.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-48921, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.jenkins.plugins

Analyze 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 798.v5cc688825312), 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-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. 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

Jenkins Pipeline: Groovy Libraries Plugin 797.v90ea_a_9b_e45a_0 and earlier does not prohibit symbolic links in shared libraries. This allows attackers able to control the content of a library used by a Pipeline job to read arbitrary files on the Jenkins controller filesystem. Pipeline: Groovy Libraries Plugin 798.v5cc688825312 prohibits symbolic links in shared libraries.

CVE-2026-48921 Affected Jenkins Pipeline Versions

1 component(s)
Fixed Versions:
798.v5cc688825312
Product / Package Ecosystem Affected Versions Fixed Version
io.jenkins.plugins:pipeline-groovy-lib
maven/io.jenkins.plugins/pipeline-groovy-lib
Maven
< 798.v5cc688825312
798.v5cc688825312

References

NVD — CVE-2026-48921 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48921
Jenkins Pipeline Source Repository REPOSITORY
https://github.com/jenkinsci/pipeline-groovy-lib-plugin
Jenkins Pipeline Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3727

Frequently Asked Questions

What is CVE-2026-48921?
CVE-2026-48921 is a security vulnerability in Jenkins Pipeline involving Groovy Libraries Plugin does not prohibit symbolic links in shared libraries under CWE-59: Improper Link Resolution Before File Access ('Link Following').
Which Jenkins Pipeline versions are affected?
Affected versions include releases prior to 798.v5cc688825312 across affected packages: io.jenkins.plugins:pipeline-groovy-lib.
What version fixes CVE-2026-48921?
Upgrading to 798.v5cc688825312 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pipeline-groovy-lib affected?
Yes, io.jenkins.plugins:pipeline-groovy-lib is affected in releases prior to 798.v5cc688825312. Upgrade your dependency to 798.v5cc688825312 or later.
What is the CVSS score of CVE-2026-48921?
CVE-2026-48921 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-48921?
CVE-2026-48921 is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following') (The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.).
How can I check Maven dependencies for CVE-2026-48921?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.jenkins.plugins'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-qjq3-wqj5-g37q",
  "modified" : "2026-07-01T19:26:57Z",
  "published" : "2026-05-27T15:33:26Z",
  "aliases" : [ "CVE-2026-48921" ],
  "summary" : "Jenkins Pipeline: Groovy Libraries Plugin does not prohibit symbolic links in shared libraries",
  "details" : "Jenkins Pipeline: Groovy Libraries Plugin 797.v90ea_a_9b_e45a_0 and earlier does not prohibit symbolic links in shared libraries.\n\nThis allows attackers able to control the content of a library used by a Pipeline job to read arbitrary files on the Jenkins controller filesystem.\n\nPipeline: Groovy Libraries Plugin 798.v5cc688825312 prohibits symbolic links in shared libraries.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.jenkins.plugins:pipeline-groovy-lib"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "798.v5cc688825312"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-48921"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/pipeline-groovy-lib-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3727"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-59" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T19:26:57Z",
    "nvd_published_at" : "2026-05-27T15:16:31Z"
  }
}