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CVE-2026-84655

medium CVSS 4.3 EPSS 0.3%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-84655 applies to, and the release that fixes it where the sources name one.

Jenkins 1.509 fixed in 2.580

At a glance

Severity
Medium
CVSS base score
4.3 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.3% probability of exploitation in the next 30 days, higher than 22% of scored vulnerabilities
Weakness
CWE-116
Published
2026-09-02
NVD CVE.org

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