GHSA-5P4M-2WFM-XMQJ JS-YAML: Quadratic CPU consumption in !!omap resolution (3.x and 4.x) — CVE-2026-59870 fix not backported

Quadratic CPU consumption in !!omap resolution js-yaml 3.x and 4.x Summary resolveYamlOmap enforces key uniqueness for !!omap sequences with a linear scan objectKeys.indexOf... inside the per-element loop, making resolution On² in the number of entries. A modestly sized YAML document therefore...