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MEDIUM

CVE-2026-84655

CVSS v3

4.3

MEDIUM

EPSS Score

0.3 %

exploit probability, as of 2026-10-02

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

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.

Technical details

Published
2026-09-02
Last Modified
2026-09-02

Frequently asked questions

What is CVE-2026-84655?

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.

Is CVE-2026-84655 actively exploited?

Active exploitation of CVE-2026-84655 has not been confirmed. Its EPSS score was 0.3% on 2026-10-02, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-84655?

CVE-2026-84655 has a CVSS v3 base score of 4.3 (MEDIUM severity).

Is CVE-2026-84655 affecting your environment?

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