CVE-2026-84655 Other in Jenkins
Attackers can inject arbitrary fields into JSON and Python API responses by controlling map property names due to improper escaping in Jenkins.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84655?
CVE-2026-84655 is a medium-severity vulnerability in Jenkins Jenkins, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Jenkins 2.579 and earlier, LTS 2.568.2 and earlier does not escape map keys when serializing objects as JSON and Python through its REST API, allowing attackers able to control map property names to inject arbitrary fields into JSON and Python API responses.
Weakness: CWE-116
Which versions are affected by CVE-2026-84655?
1 open source package ship an affected version, including jenkins. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
jenkins Bitnami | All versions | 2.568.3, 2.580.0 |
Products include Jenkins Jenkins.
How do I fix CVE-2026-84655?
Upgrade jenkins to a fixed version for your release line: 2.568.3 or 2.580.0.
Is CVE-2026-84655 being exploited?
There is no known exploitation of CVE-2026-84655 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-2026-84655, GHSA-g8v4-mgp3-5f84, MINI-477x-3q5j-fc42, MINI-8gch-mr9w-xmxm, MINI-g92v-9qgp-95rx, MINI-mx7r-jfw3-r6mq and 3 more.