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CVE-2026-53550— js-yaml: Quadratic-complexity DoS in merge key handling via repeated aliases

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 4.2.0之前版本存在资源管理错误漏洞，该漏洞源于合并键处理中重复使用别名导致算法性CPU耗尽，可能造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
nodeca js-yaml >= 4.0.0, < 4.2.0 affected
< 3.15.0 affected
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I. Basic Information for CVE-2026-53550

Vulnerability Information
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Vulnerability Title
js-yaml: Quadratic-complexity DoS in merge key handling via repeated aliases
Source: CVE Program / CVE List V5
Vulnerability Description
js-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 merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.
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 4.2.0之前版本存在资源管理错误漏洞，该漏洞源于合并键处理中重复使用别名导致算法性CPU耗尽，可能造成拒绝服务。
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 >= 4.0.0, < 4.2.0 -

II. Public POCs for CVE-2026-53550

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III. Intelligence Information for CVE-2026-53550

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Vendor Advisories for CVE-2026-53550 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-53550

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