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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-59868

js-yaml: YAML merge-key chains can force quadratic CPU consumption

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

nodeca js-yaml

  • >= 5.0.0, < 5.2.0affected

References