CVE-2026-117624 Jenkins Project CVE debrief

Who should care

Jenkins administrators and users should assess exposure and prioritize updates to prevent potential code injection attacks. This includes verifying and updating Jenkins instances, reviewing and restricting deserialization of objects, and monitoring for suspicious activity. Affected operators, platforms, vulnerability-management, and security teams should be aware of the potential impacts and take necessary actions.

Why it matters

CVE-2026-117624 is a high-severity vulnerability in Jenkins that allows attackers to bypass security restrictions and potentially inject malicious code. Defenders should prioritize verifying and updating Jenkins instances, reviewing and restricting deserialization of objects, and monitoring for suspicious activity.

• Potential code injection attacks require verification and updates to prevent.
• Defenders should verify and restrict deserialization of objects in Jenkins configuration files to prevent exploitation.
• Monitoring Jenkins instances for suspicious activity is necessary to detect potential attacks.

Technical summary

The vulnerability exists in Jenkins 2.587 and earlier, LTS 2.580.1 and earlier. It allows attackers to bypass the root element check and potentially inject nested objects due to inconsistent enforcement of deserialization restrictions on objects stored in independent top-level configuration files as nested values. This emphasizes the need for defenders to prioritize verifying and updating Jenkins instances to prevent potential code injection attacks. Reviewing and restricting deserialization of objects in Jenkins configuration files is also crucial.

Defensive priority

Defenders should prioritize verifying and updating Jenkins instances to prevent potential code injection attacks.

Recommended defensive actions

• Verify and update Jenkins instances to version 2.588 or later, or LTS 2.580.2 or later.
• Review and restrict deserialization of objects in Jenkins configuration files.
• Monitor Jenkins instances for suspicious activity.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and vector. However, additional information on exploitation or affected versions is limited. Defenders should verify and restrict deserialization of objects in Jenkins configuration files to prevent exploitation and monitor Jenkins instances for suspicious activity. The CVE Program record and NVD detail page offer source-provided CVE metadata and vulnerability assessment.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.