Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-06-10T13:05:57 jenkins: Jenkins: Arbitrary code execution via deserialization of attacker-controlled configuration 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-502

In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them to handle HTTP requests afterwards. This can be used to impersonate any user and send HTTP requests on their behalf, up to and including use of the Script Console to run arbitrary code, or to read arbitrary files from the Jenkins controller.

A flaw was found in Jenkins. Attackers can exploit a deserialization vulnerability by submitting a specially crafted `config.xml` file. This allows them to deserialize arbitrary types, leading to the ability to impersonate users and send HTTP requests on their behalf. The most critical impact is the potential for arbitrary code execution through the Script Console, as well as unauthorized reading of files from the Jenkins controller.

OpenShift Developer Tools and Services Affected jenkins https://www.cve.org/CVERecord?id=CVE-2026-53435 https://nvd.nist.gov/vuln/detail/CVE-2026-53435 https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3707