Deserialization Flaw in Jenkins Core Products

CVE-2026-70426

What is CVE-2026-70426?

CVE-2026-70426 is identified as a deserialization flaw within the Jenkins core products, a popular open-source automation server used for continuous integration and continuous delivery (CI/CD) processes. The vulnerability primarily affects the Remoting component, which handles communication between Jenkins agents and the master server. Specifically, the JEP-200 class filter, designed to limit the classes that can be deserialized, is not enforced properly for certain classes accessed through a fallback mechanism. This flaw can permit unauthorized agent processes, or malicious code running on agents, to bypass essential security filters, potentially leading to unauthorized access and manipulation of Jenkins operations. The impact of this vulnerability is significant, as successful exploitation could enable attackers to execute arbitrary code within the Jenkins environment.

Potential impact of CVE-2026-70426

1. Unauthorized Code Execution: The deserialization flaw allows attackers to bypass critical security measures, leading to the possibility of executing arbitrary code on the Jenkins server or its agents. This could result in the manipulation of build processes or deployment of malicious software.

2. Compromise of CI/CD Integrity: As Jenkins serves as a central hub for development and deployment pipelines, exploiting this vulnerability can compromise the integrity of software builds. Altered or malicious builds could be introduced into production environments, posing risks to applications and services dependent on Jenkins.

3. Escalation of Privileges: An attacker with Agent/Connect permissions could leverage this vulnerability to escalate their privileges, allowing them to gain control over more sensitive aspects of the Jenkins environment. This could facilitate further attacks on associated systems, leading to broader security implications within the organization's infrastructure.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

This is an advertDeploy the Patch →

References