CVE-2026-33002: Jenkins core Jenkins Has A DNS Rebinding Vulnerability

HIGH
Advisory Identifier: GHSA-phhv-63fh-rrc8
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CVSS 7.5
CWE-350 CWE-346
Published
Advisory Summary

CVE-2026-33002 is a HIGH (CVSS 7.5) jenkins has a dns rebinding vulnerability (CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action) affecting Jenkins core libraries in the Maven ecosystem. The issue involves jenkins has a dns rebinding vulnerability in websocket cli origin validation. Remediation is available by upgrading affected packages to version 2.555.

CVE-2026-33002 at a Glance

CVE Identifier CVE-2026-33002
GHSA Identifier GHSA-phhv-63fh-rrc8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action
Affected Product Jenkins core
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:N/UI:R/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2026-33002

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: 2.555 
<dependency>
    <groupId>org.jenkins-ci.main</groupId>
    <artifactId>jenkins-core</artifactId>
    <version>2.555</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-2026-33002, 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 2.555), 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-350: Reliance on Reverse DNS Resolution for a Security-Critical Action, where the product performs reverse dns resolution on an ip address to obtain the hostname and make a security decision, but it does not properly ensure that the ip address is truly associated with the hostname. 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 2.442 through 2.554 (both inclusive), LTS 2.426.3 through LTS 2.541.2 (both inclusive) performs origin validation of requests made through the CLI WebSocket endpoint by computing the expected origin for comparison using the Host or X-Forwarded-Host HTTP request headers, making it vulnerable to DNS rebinding attacks that allow bypassing origin validation.

CVE-2026-33002 Affected Jenkins core Versions

1 component(s)
Fixed Versions:
2.555
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.main:jenkins-core
maven/org.jenkins-ci.main/jenkins-core
Maven
≥ 2.442
< 2.555
2.555

References

NVD — CVE-2026-33002 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33002
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/jenkins/commit/348666da7136ef8270f88c0a7350562b0ba7f8ce
Jenkins core Source Repository REPOSITORY
https://github.com/jenkinsci/jenkins
Jenkins core Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-03-18/#SECURITY-3674

Frequently Asked Questions

What is CVE-2026-33002?
CVE-2026-33002 is a security vulnerability in Jenkins core involving Jenkins has a DNS rebinding vulnerability in WebSocket CLI origin validation under CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action.
Which Jenkins core versions are affected?
Affected versions include releases prior to 2.555 across affected packages: org.jenkins-ci.main:jenkins-core.
What version fixes CVE-2026-33002?
Upgrading to 2.555 (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 2.555. Upgrade your dependency to 2.555 or later.
What is the CVSS score of CVE-2026-33002?
CVE-2026-33002 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-33002?
CVE-2026-33002 is classified under CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action (The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname.).
How can I check Maven dependencies for CVE-2026-33002?
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-phhv-63fh-rrc8",
  "modified" : "2026-03-19T12:46:30Z",
  "published" : "2026-03-18T18:31:16Z",
  "aliases" : [ "CVE-2026-33002" ],
  "summary" : "Jenkins has a DNS rebinding vulnerability in WebSocket CLI origin validation",
  "details" : "Jenkins 2.442 through 2.554 (both inclusive), LTS 2.426.3 through LTS 2.541.2 (both inclusive) performs origin validation of requests made through the CLI WebSocket endpoint by computing the expected origin for comparison using the Host or X-Forwarded-Host HTTP request headers, making it vulnerable to DNS rebinding attacks that allow bypassing origin validation.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.main:jenkins-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.442"
      }, {
        "fixed" : "2.555"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33002"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/jenkins/commit/348666da7136ef8270f88c0a7350562b0ba7f8ce"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/jenkins"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-03-18/#SECURITY-3674"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-346", "CWE-350" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-19T12:46:29Z",
    "nvd_published_at" : "2026-03-18T16:16:28Z"
  }
}