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.

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 des…

Vulnerability class: Insecure Deserialization

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.

Affected products

Jenkins Project — versions 2.576, 2.568.2
Jenkins Project Remoting — versions 3385.vf1123fb_515da_, 3355.3357.v931d3c992987

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

jenkinsci-cert@googlegroups.com (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.