CVE-2026-27100: Jenkins core Jenkins Has A Build Information Vulnerability

MODERATE
Advisory Identifier: GHSA-wfhp-qgm8-5p5c
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CVSS 4.3
CWE-200
Published
Advisory Summary

CVE-2026-27100 is a MODERATE (CVSS 4.3) jenkins has a build information vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Jenkins core libraries in the Maven ecosystem. The issue involves jenkins has a build information disclosure vulnerability through run parameter. Remediation is available by upgrading affected packages to version 2.551, 2.541.2.

CVE-2026-27100 at a Glance

CVE Identifier CVE-2026-27100
GHSA Identifier GHSA-wfhp-qgm8-5p5c
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Jenkins core
Package Ecosystem Maven
Published Date
Last Updated

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:L/I:N/A:N).

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

How to Fix CVE-2026-27100

To remediate this vulnerability, upgrade all affected Jenkins core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.jenkins-ci.main:jenkins-core fixed: 2.551 
<dependency>
    <groupId>org.jenkins-ci.main</groupId>
    <artifactId>jenkins-core</artifactId>
    <version>2.551</version>
</dependency>
org.jenkins-ci.main:jenkins-core fixed: 2.541.2 
<dependency>
    <groupId>org.jenkins-ci.main</groupId>
    <artifactId>jenkins-core</artifactId>
    <version>2.541.2</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=org.jenkins-ci.main

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-27100, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.main

Analyze the terminal output to locate any version of Jenkins core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.551), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.main 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Jenkins core, 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 2.550 and earlier, LTS 2.541.1 and earlier accepts Run Parameter values that refer to builds the user submitting the build does not have access to, allowing attackers with Item/Build and Item/Configure permission to obtain information about the existence of jobs, the existence of builds, and if a specified build exists, its display name.

CVE-2026-27100 Affected Jenkins core Versions

2 component(s)
Fixed Versions:
2.5512.541.2
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.main:jenkins-core
maven/org.jenkins-ci.main/jenkins-core
Maven
≥ 2.542
< 2.551
2.551
org.jenkins-ci.main:jenkins-core
maven/org.jenkins-ci.main/jenkins-core
Maven
< 2.541.2
2.541.2

References

NVD — CVE-2026-27100 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27100
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/jenkins/commit/f92eadb5813f04ca27439455e2573c3171e93a45
Jenkins core Source Repository REPOSITORY
https://github.com/jenkinsci/jenkins
Jenkins core Release RELEASE
https://github.com/jenkinsci/jenkins/releases/tag/jenkins-2.541.2
Jenkins core Release RELEASE
https://github.com/jenkinsci/jenkins/releases/tag/jenkins-2.551
Jenkins core Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-02-18/#SECURITY-3658

Frequently Asked Questions

What is CVE-2026-27100?
CVE-2026-27100 is a security vulnerability in Jenkins core involving Jenkins has a build information disclosure vulnerability through Run Parameter under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Jenkins core versions are affected?
Affected versions include releases prior to 2.551, 2.541.2 across affected packages: org.jenkins-ci.main:jenkins-core.
What version fixes CVE-2026-27100?
Upgrading to 2.551, 2.541.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jenkins-core affected?
Yes, org.jenkins-ci.main:jenkins-core is affected in releases prior to 2.551, 2.541.2. Upgrade your dependency to 2.551, 2.541.2 or later.
What is the CVSS score of CVE-2026-27100?
CVE-2026-27100 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-27100?
CVE-2026-27100 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Maven dependencies for CVE-2026-27100?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.main'. 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-wfhp-qgm8-5p5c",
  "modified" : "2026-02-25T20:00:47Z",
  "published" : "2026-02-18T15:31:27Z",
  "aliases" : [ "CVE-2026-27100" ],
  "summary" : "Jenkins has a build information disclosure vulnerability through Run Parameter ",
  "details" : "Jenkins 2.550 and earlier, LTS 2.541.1 and earlier accepts Run Parameter values that refer to builds the user submitting the build does not have access to, allowing attackers with Item/Build and Item/Configure permission to obtain information about the existence of jobs, the existence of builds, and if a specified build exists, its display name.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.main:jenkins-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.542"
      }, {
        "fixed" : "2.551"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.main:jenkins-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.541.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27100"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/jenkins/commit/f92eadb5813f04ca27439455e2573c3171e93a45"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/jenkins"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/jenkins/releases/tag/jenkins-2.541.2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/jenkins/releases/tag/jenkins-2.551"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-02-18/#SECURITY-3658"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-19T20:26:03Z",
    "nvd_published_at" : "2026-02-18T15:18:43Z"
  }
}