CVE-2026-70426: Jenkins Project Jenkins

Critical severity, CVSS 9.0. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Jenkins Project Jenkins: before 2.568.2 (fixed in 2.568.2); from 2.569, before 2.576 (fixed in 2.576)
• Jenkins Project Remoting: before 3355.3357.v931d3c992987 (fixed in 3355.3357.v931d3c992987); from 3356, before 3385.vf1123fb_515da_ (fixed in 3385.vf1123fb_515da_)

Published 2026-08-05. Last modified 2026-08-31.