CVE-2026-84650
Description
A flaw was found in Jenkins. Attackers capable of submitting configuration updates can exploit a deserialization vulnerability by specifying values for transient fields. Although these fields are normally excluded from serialization, they are still processed during deserialization, which can lead to the overwriting of configuration objects. The ultimate impact depends on how these manipulated fields are subsequently used within the application.
Statement
A flaw was found in Jenkins. Configuration overwrite is possible via transient field deserialization, allowing authenticated users to specify values of transient fields during configuration updates. This issue affects Jenkins versions up to 2.579 (weekly) and up to 2.568.2 (LTS).
Mitigation
Update to Jenkins 2.580 (weekly) or Jenkins LTS 2.568.3 or later.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.8 | N/A | 8.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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