CVE-2026-59870 - js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing

CVE-2026-59870 - js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing

https://cvefeed.io/rssfeed/latest.atom / Wed, 07/08/2026 - 19:04
CVE ID :CVE-2026-59870
Published : July 8, 2026, 4:16 p.m. | 29 minutes ago
Description :js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 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. This issue is fixed in version 5.2.1.
Severity: 5.3 | MEDIUM
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