CVE-2026-70426
CriticalCVSS 9.0Summary
In Jenkins 2.575 and earlier, and LTS 2.568.1 and earlier, the JEP-200 class filter is not applied to classes resolved via a fallback path in Remoting deserialization. This allows agents, code on agents, and attackers with Agent/Connect permission to bypass the filter for classes on the Jenkins core classpath.
Risk Assessment
Risk of remote code execution or privilege escalation in Jenkins, potentially leading to full compromise of the CI/CD server.
Recommendation
Update Jenkins to a version newer than 2.575 (or LTS newer than 2.568.1). Restrict Agent/Connect permissions to trusted entities only.
Original NVD description (English source)
In Remoting 3384.v60d89463d9e0 and earlier, except 3355.3357.v931d3c992987, included in Jenkins 2.575 and earlier, LTS 2.568.1 and earlier, the JEP-200 class filter is not applied to classes resolved via a fallback path in the Remoting deserialization implementation, allowing agent processes, code running on agents, and attackers with Agent/Connect permission to bypass the JEP-200 deserialization filter for classes on the Jenkins core classpath.