Critical (9.9) in jenkins groovy libraries. EPSS 1.4% chance of exploitation in the next 30 days. Fixed in org.jenkins-ci.plugins.workflow:workflow-cps-global-lib 588.v576c103a_ff86.
A sandbox bypass vulnerability in Jenkins Pipeline: Deprecated Groovy Libraries Plugin 583.vf3b_454e43966 and earlier allows attackers with permission to define untrusted Pipeline libraries and to define and run sandboxed scripts, including Pipelines, to bypass the sandbox protection and execute arbitrary code in the context of the Jenkins controller JVM.
Severity
CVSS 3.1
9.9 critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS
1.4% chance of exploitation in the next 30 days; higher than 72% of CVEs (scores of 2026-10-31)