AIKIDO-2026-408649
jenkins-core is vulnerable to Improper Link Resolution Before File Access
82
High Risk
This Affects:
jenkins-coreTL;DR
Archive extraction for .tar and .tar.gz files does not safely handle symbolic links whose names are effectively empty. An attacker who controls an agent process can send a crafted archive so the controller writes files outside the intended extract location, including under JENKINS_HOME/init.groovy.d/ or JENKINS_HOME/plugins/, which can lead to code execution. The fix refuses to extract archives that contain those symbolic links.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and attackers can control agent processes that send archives to the controller.
Background info
jenkins-core is vulnerable to Improper Link Resolution Before File Access in versions 0.0.1 - 2.568.1 and 2.569 - 2.575.
How to fix this
Upgrade the org.jenkins-ci.main:jenkins-core library to the patch version.
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