CVE-2026-59868 — js-yaml: YAML merge-key chains can force quadratic CPU consumption
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows on…
Published: 2026-07-08 · CVSS: 5.3 · CVSS 3.1
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7