PT-2026-56490 · Nodeca · Js-Yaml

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59869

NVD

CVSS v3.1

7.5

High

Base vector

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

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.

Fix

Weakness Enumeration

CWE-407

Related Identifiers

CVE-2026-59869

Affected Products

Js-Yaml

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-59869 · Security Note
• https://github.com/nodeca/js-yaml/releases/tag/4.3.0 · Note
• https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m · Note
• https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7 · Note
• https://github.com/nodeca/js-yaml/releases/tag/3.15.0 · Note
• https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4 · Note