CVE-2018-1000861: Jenkins core Deserialization Of Untrusted Data Vulnerability

CRITICAL
Advisory Identifier: GHSA-hhpm-5cp2-hg4x
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CVSS 9.8
CWE-502
Published
Advisory Summary

CVE-2018-1000861 is a CRITICAL (CVSS 9.8) deserialization of untrusted data vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Jenkins core libraries in the Maven ecosystem. The issue involves deserialization of untrusted data in jenkins. Remediation is available by upgrading affected packages to version 2.138.4, 2.154.

CVE-2018-1000861 at a Glance

CVE Identifier CVE-2018-1000861
GHSA Identifier GHSA-hhpm-5cp2-hg4x
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Jenkins core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2018-1000861

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: 2.138.4 
<dependency>
    <groupId>org.jenkins-ci.main</groupId>
    <artifactId>jenkins-core</artifactId>
    <version>2.138.4</version>
</dependency>
org.jenkins-ci.main:jenkins-core fixed: 2.154 
<dependency>
    <groupId>org.jenkins-ci.main</groupId>
    <artifactId>jenkins-core</artifactId>
    <version>2.154</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-2018-1000861, 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 2.138.4), 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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. 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

A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.

CVE-2018-1000861 Affected Jenkins core Versions

2 component(s)
Fixed Versions:
2.138.42.154
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.main:jenkins-core
maven/org.jenkins-ci.main/jenkins-core
Maven
< 2.138.4
2.138.4
org.jenkins-ci.main:jenkins-core
maven/org.jenkins-ci.main/jenkins-core
Maven
≥ 2.140
< 2.154
2.154

References

NVD — CVE-2018-1000861 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000861
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/jenkins/commit/47f38d714c99e1841fb737ad1005618eb26ed852
access.redhat.com/errata/rhba-2019:00... WEB
https://access.redhat.com/errata/RHBA-2019:0024
Jenkins core Security Information SECURITY
https://jenkins.io/security/advisory/2018-12-05/#SECURITY-595
www.cisa.gov/known-exploited-vul... WEB
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-1000861
Jenkins core Security Information SECURITY
http://packetstormsecurity.com/files/166778/Jenkins-Remote-Code-Execution.html
Jenkins core Security Information SECURITY
http://www.securityfocus.com/bid/106176

Frequently Asked Questions

What is CVE-2018-1000861?
CVE-2018-1000861 is a security vulnerability in Jenkins core involving Deserialization of Untrusted Data in Jenkins under CWE-502: Deserialization of Untrusted Data.
Which Jenkins core versions are affected?
Affected versions include releases prior to 2.138.4, 2.154 across affected packages: org.jenkins-ci.main:jenkins-core.
What version fixes CVE-2018-1000861?
Upgrading to 2.138.4, 2.154 (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 2.138.4, 2.154. Upgrade your dependency to 2.138.4, 2.154 or later.
What is the CVSS score of CVE-2018-1000861?
CVE-2018-1000861 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H.
What CWE is associated with CVE-2018-1000861?
CVE-2018-1000861 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Maven dependencies for CVE-2018-1000861?
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-hhpm-5cp2-hg4x",
  "modified" : "2025-10-22T17:35:50Z",
  "published" : "2022-05-13T01:01:00Z",
  "aliases" : [ "CVE-2018-1000861" ],
  "summary" : "Deserialization of Untrusted Data in Jenkins",
  "details" : "A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.main:jenkins-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.138.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.138.3"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.main:jenkins-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.140"
      }, {
        "fixed" : "2.154"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.153"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000861"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/jenkins/commit/47f38d714c99e1841fb737ad1005618eb26ed852"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHBA-2019:0024"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2018-12-05/#SECURITY-595"
  }, {
    "type" : "WEB",
    "url" : "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-1000861"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/166778/Jenkins-Remote-Code-Execution.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/106176"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-30T15:56:17Z",
    "nvd_published_at" : "2018-12-10T14:29:00Z"
  }
}