CVE-2026-59870 (GCVE-0-2026-59870)
Vulnerability from cvelistv5
Published
2026-07-08 15:13
Modified
2026-10-06 15:07
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Summary
js-yaml is a JavaScript YAML parser and dumper. Prior to 3.15.1, 4.3.1, and 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. In v3 and v4, !!omap is active and exploitable by default. v5 doesn't use !!omap by default, and the chances of activating it are very low.This issue is fixed in 3.15.1, 4.3.1, and 5.2.1.
References
Impacted products
Vendor Product Version
nodeca js-yaml Version: >= 5.0.0, < 5.2.1
Version: >= 3.0.0, < 3.15.1
Version: >= 4.0.0, < 4.3.1
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