Jenkins <2.575 LTS: Bypass JEP-200 Deserialization Filter via Agent
CVE-2026-70426 Published on August 5, 2026
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.
Vulnerability Analysis
CVE-2026-70426 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2026-70426 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2026-70426
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Affected Versions
Jenkins Project Jenkins:- Version 2.576 and below * is unaffected.
- Version 2.568.2 and below 2.568.* is unaffected.
- Version 3385.vf1123fb_515da_ and below * is unaffected.
- Version 3355.3357.v931d3c992987 and below 3355.* is unaffected.