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Vulnerability record · CVE-2026-59869 · published 8 July 2026

CVE-2026-59869: Nodeca js-yaml vulnerability

Nodeca · Js Yaml

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.

7.5 CVSS 3.1 High EPSS 0.59% · top 54.2% CWE-407 · CWE-407
7.5CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
13 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7 Patch
https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4 Patch
https://github.com/nodeca/js-yaml/releases/tag/3.15.0 Release Notes
https://github.com/nodeca/js-yaml/releases/tag/4.3.0 Release Notes
https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m ExploitVendor Advisory
https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-59868Nodeca js-yaml allocation without limits vulnerabilityjs-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 …EPSS 0.64%7.5CVE-2026-59870Nodeca js-yaml allocation without limits vulnerabilityjs-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 om…EPSS 0.64%6.8CVE-2013-4660Nodeca js-yaml improper input validation vulnerabilityThe JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to …EPSS 17%5.3CVE-2026-53550Nodeca js-yaml vulnerabilityjs-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml …EPSS 0.42%5.3CVE-2025-64718Nodeca js-yaml prototype pollution vulnerabilityjs-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it's possible for an attacker to modify the prototype of the resu…EPSS 0.41%

Source: NIST National Vulnerability Database (record CVE-2026-59869), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.