CVE-2026-84655

4.3 mediumEPSS 0.5%

Medium (4.3) in jenkins jenkins. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.3 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 41% of CVEs (scores of 2026-10-31)
CWE: CWE-116
Published: 2026-09-02
Modified: 2026-09-15
Record from: the NVD, synced 2026-10-19

Affected

jenkins:jenkins

References

https://www.jenkins.io/security/advisory/2026-09-02/#SECURITY-3879

Check your stack JSON