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.

  • Published Sep 2, 2026
  • CVSS 4.3 medium
  • 0.3% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-84655 at the National Vulnerability Database