CVE-2022-31055: Google Kctf

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

kCTF is a Kubernetes-based infrastructure for capture the flag (CTF) competitions. Prior to version 1.6.0, the kctf cluster set-src-ip-ranges was broken and allowed traffic from any IP. The problem has been patched in v1.6.0. As a workaround, those who want to test challenges privately can mark them as `public: false` and use `kctf chal debug port-forward` to connect.

Affected products

• Google Kctf: before 1.6.0 (fixed in 1.6.0)

Published 2022-06-13. Last modified 2026-06-17.