Deserialization of Untrusted Data in Jenkins products - CVE-2026-70426
Published: August 6, 2026
Vulnerability identifier: #VU141038
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70426
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data while missing the JEP-200 class filter. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Jenkins Remoting
Jenkins
Jenkins LTS
Jenkins
Jenkins LTS
How to mitigate CVE-2026-70426
Install updates from vendor's website.
Jenkins - update to 2.576
Jenkins LTS - update to 2.568.2
Jenkins LTS - update to 2.568.2