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Vulnerability record · CVE-2026-70426 · published 5 August 2026

CVE-2026-70426: Deserialization of untrusted data vulnerability

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.

9.0 CVSS 3.1 Critical EPSS 0.52% · top 58.5% CWE-502 · Deserialization of untrusted data Awaiting Analysis
9.0CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
31 Aug 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://www.jenkins.io/security/advisory/2026-08-05/#SECURITY-3911

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Source: NIST National Vulnerability Database (record CVE-2026-70426), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.