PT-2026-56489 · Nodeca · Js-Yaml

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59868

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Fix

Weakness Enumeration

CWE-407

Related Identifiers

CVE-2026-59868

Affected Products

Js-Yaml

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-59868 · Security Note
• https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mv · Note
• https://github.com/nodeca/js-yaml/commit/3105455b81dee69e0fd36e09ac0b2ccfdb54adc1 · Note
• https://github.com/nodeca/js-yaml/releases/tag/5.2.0 · Note