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Prototype Pollution via parse() in NodeJS flatted

🗓️ 19 Mar 2026 17:43:54Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 20 Views

Flatted parse() can leak Array.prototype via non numeric keys, enabling prototype pollution.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in IBM watsonx Code Assistant On Prem
9 Apr 202610:57
–ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in IBM Edge Application Manager
23 Apr 202619:33
–ibm
IBM Security Bulletins		Security Bulletin: IBM App Connect Enterprise Certified Container operator and operands are vulnerable to arbitrary code execution, loss of confidentiality and denial of service
6 May 202613:05
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - Monitor Component uses flatted-3.3.1.tgz, flatted-3.3.2.tgz, flatted-3.3.3.tgz which is vulnerable to CVE-2026-33228.
1 May 202612:00
–ibm
IBM Security Bulletins		Security Bulletin: Security vulnerabilities have been found in IBM Verify Identity Access Digital Credentials
12 Jun 202601:05
–ibm
IBM Security Bulletins		Security Bulletin: Due to the use of flatted, IBM DevOps Solution Workbench ist affected by leaking a live reference to Array.Prototype
24 Mar 202613:36
–ibm
IBM Security Bulletins		Security Bulletin: Vulnerability in flatted affects IBM watsonx Assistant Cartridge and IBM watsonx Orchestrate with watsonx Assistant Cartridge.
22 Jun 202613:17
–ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities affect IBM Cloud Pak System
25 Jun 202616:49
–ibm
IBM Security Bulletins		Security Bulletin: IBM Quantum Safe Remediator is affected by multiple vulnerabilities
5 May 202615:14
–ibm
ATTACKERKB		CVE-2026-33228
20 Mar 202623:06
–attackerkb
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Vulners
Node
webreflectionflattedRange≤3.4.1npm

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25 Mar 2026 18:22Current
6Medium risk
Vulners AI Score6
CVSS 3.19.8
CVSS 49.3
EPSS0.00613
SSVC
CWE-1321
flatted parseprototype pollutionarray prototypenon numeric keysjson parsing flawglobal prototype
20