CVE-2026-59869

Published: Jul 8, 2026Modified: Jul 13, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

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.

Affected (2)

Products: Nodeca: Js Yaml

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Nodeca Js Yaml	From 3.0.0 to 3.15.0
Nodeca Js Yaml	From 4.0.0 to 4.3.0

Related CWEs

Inefficient Algorithmic Complexity

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

References (6)

https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7

Source: security-advisories@github.com

Patch

https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4

Source: security-advisories@github.com

Patch

https://github.com/nodeca/js-yaml/releases/tag/3.15.0

Source: security-advisories@github.com

Release Notes

https://github.com/nodeca/js-yaml/releases/tag/4.3.0

Source: security-advisories@github.com

Release Notes

https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m

Source: security-advisories@github.com

ExploitVendor Advisory

https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

ExploitVendor Advisory

Timeline

No history available yet.