CVE-2026-33002 Jenkins has a DNS rebinding vulnerability in WebSocket CLI origin validation
Attackers can bypass origin validation in Jenkins CLI WebSocket endpoint via DNS rebinding, allowing unauthorized access to the interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-33002?
CVE-2026-33002 is a high-severity vulnerability in Jenkins Jenkins, published on 18 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-350
Which versions are affected by CVE-2026-33002?
3 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.main:jenkins-core Maven | From 2.442 | 2.555 |
org.jenkins-ci.main:jenkins-core Maven | From 2.442 | 2.555 |
jenkins Bitnami | From 2.426.3 | 2.541.3, 2.555.0 |
Products include Jenkins Jenkins.
How do I fix CVE-2026-33002?
Upgrade org.jenkins-ci.main:jenkins-core to 2.555 or later.
Is CVE-2026-33002 being exploited?
There is no known exploitation of CVE-2026-33002 in the wild and no public exploit code.
Other vulnerabilities in Jenkins Jenkins
- CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal
- CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data
- CVE-2017-1000353 Jenkins Remote Code Execution
- CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure
- CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
Sources
Also known as BIT-jenkins-2026-33002, GHSA-phhv-63fh-rrc8, MINI-33pr-4hpj-x2mq, MINI-4gc7-qc28-ch56, MINI-hq94-j97j-rpp2, MINI-pm5j-wwrw-56wh and 2 more.