CVE-2026-59869

Aliases:GHSA-52cp-r559-cp3m
Advisory lineage Upstream: 0 Downstream: 8
PUBLISHED
Published: 08 Jul 2026, 15:15
Last modified:09 Jul 2026, 15:14

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (cve.org)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

08 Jul 2026, 15:15
Published
Vulnerability first disclosed
09 Jul 2026, 15:14
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Techniques & Countermeasures

  • CWE-407•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.

Affected Systems

  • nodeca•js-yaml

    ≥ 3.0.0, < 3.15.0 | ≥ 4.0.0, < 4.3.0

  • Npm•js-yaml

    ≥ 3.0.0, < 3.15.0 | ≥ 4.0.0, < 4.3.0

References (7)