Deserialization in Jenkins Project
CVE-2026-70426
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 class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Jenkins Project — versions 2.576, 2.568.2
- Jenkins Project Remoting — versions 3385.vf1123fb_515da_, 3355.3357.v931d3c992987
Weakness classification (CWE)
References
- www.jenkins.io/security/advisory/2026-08-05/ (vendor-advisory)
Frequently asked questions
- What is CVE-2026-70426?
- CVE-2026-70426 is a critical-severity vulnerability in Jenkins Project, classified under Deserialization of Untrusted Data. CVSS score: 9.0/10. Published 2026-08-05.
- How severe is CVE-2026-70426?
- Critical severity. CVSS v3 base score is 9.0 out of 10.