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CVE-2026-59869

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-59869

Severity

7.5

High

CVSS V3

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Summary

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

Description

js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, 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.

References

Affected packages

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