Jenkins <=2.579 LTS <=2.568.2 JSON Map Key Injection via REST API
CVE-2026-84655 Published on September 2, 2026

Jenkins 2.579 and earlier, LTS 2.568.2 and earlier does not escape map keys when serializing objects as JSON and Python through its REST API, allowing attackers able to control map property names to inject arbitrary fields into JSON and Python API responses.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-84655 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
NONE

Weakness Type

What is an Output Sanitization Vulnerability?

The software prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

CVE-2026-84655 has been classified to as an Output Sanitization vulnerability or weakness.


Products Associated with CVE-2026-84655

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Jenkins
 

Affected Versions

Jenkins Project Jenkins: