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Inefficient Algorithmic Complexity in js-yaml

CVE-2026-59869

  • js-yaml
  • org.webjars:js-yaml
  • org.webjars.npm:js-yaml
High
7.5/10

Summary

js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 prior to 3.15.0 and from 4.0.0 prior to 4.3.0, from 5.0.0 prior to 5.1.0, 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 versions 3.15.0 and 4.3.0.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-407 - Inefficient Algorithmic Complexity

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

References

Advisory Timeline

  • Published