GHSA-H67P-54HQ-RP68 JS-YAML: Quadratic-complexity DoS in merge key handling via repeated aliases

Summary A crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relative...