CVE-2026-59868

PoC —

CVSS 3.1

7.5 high

EPSS

<1%p49

Published

Jul 8, 2026 (Jul 8, 2026)

Modified

Jul 13, 2026

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.

Vendors: nodeca
Products: js-yaml
Weakness: CWE-407, CWE-770
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.6%)

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