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CVE-2026-59868— js-yaml: YAML merge-key chains can force quadratic CPU consumption

Quick assessment

Affected
nodeca js-yaml
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nodeca JS-YAML是Nodeca个人开发者开源的一个JavaScript YAML解析器和转储器。 Nodeca js-yaml 5.0.0版本至5.2.0之前版本存在资源管理错误漏洞，该漏洞源于当 merge keys 启用时，在链式映射中使用合并键会导致解析文档时CPU时间呈二次方增长。

CVSS 5.3 · Medium EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
nodeca js-yaml >= 5.0.0, < 5.2.0 affected
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I. Basic Information for CVE-2026-59868

Vulnerability Information
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Vulnerability Title
js-yaml: YAML merge-key chains can force quadratic CPU consumption
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Nodeca js-yaml 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nodeca JS-YAML是Nodeca个人开发者开源的一个JavaScript YAML解析器和转储器。 Nodeca js-yaml 5.0.0版本至5.2.0之前版本存在资源管理错误漏洞，该漏洞源于当 merge keys 启用时，在链式映射中使用合并键会导致解析文档时CPU时间呈二次方增长。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nodeca js-yaml >= 5.0.0, < 5.2.0 -

II. Public POCs for CVE-2026-59868

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III. Intelligence Information for CVE-2026-59868

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Patches & Fixes for CVE-2026-59868 (2)

Vendor Advisories for CVE-2026-59868 (1)

Same Patch Batch · nodeca · 2026-07-08 · 3 CVEs total

CVE-2026-59869 7.5 HIGH js-yaml: YAML merge-key chains can force quadratic CPU consumption
CVE-2026-59870 5.3 MEDIUM js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing

IV. Related Vulnerabilities

Same product: js-yaml
Same vendor: nodeca
Same weakness: CWE-407

V. Comments for CVE-2026-59868

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