What is CVE-2026-84647?

CVE-2026-84647 is a high-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-02.

How severe is CVE-2026-84647?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-84647

CVE-2026-84647

In Stapler 2107.v8dfcb_e8ed317 and earlier, except 2088.2093.vd7c3e58008a_6, included in Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, Stapler does not restrict the types of objects that can be instantiated via form data binding to those compatible with the expected field type, allowing attackers with Overall/Read permission to instantiate types related to configuration for which that field type was not intended.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

jenkinsci-cert@googlegroups.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-84647?: CVE-2026-84647 is a high-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-02.
How severe is CVE-2026-84647?: High severity. CVSS v3 base score is 8.8 out of 10.