CVE-2026-33228

🗓️ 20 Mar 2026 23:06:48Reported by GitHub_MType

Flatted parse() can pollute prototypes via attacker-controlled keys like __proto__; fixed in 3.4.2.

Reporter	Title	Published	Views	Family All 41
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: IBM Quantum Safe Remediator is affected by multiple vulnerabilities	5 May 202615:14	–	ibm
ATTACKERKB	CVE-2026-33228	20 Mar 202623:06	–	attackerkb
Chainguard	CVE-2026-33228 vulnerabilities	21 Mar 202601:17	–	cgr
Circl	CVE-2026-33228	21 Mar 202600:43	–	circl

NVD

Vulners

Node

webreflection flattedRange<3.4.2node.js

[
  {
    "vendor": "WebReflection",
    "product": "flatted",
    "versions": [
      {
        "version": "< 3.4.2",
        "status": "affected"
      }
    ]
  }
]

Source	Link
github	www.github.com/WebReflection/flatted/commit/885ddcc33cf9657caf38c57c7be45ae1c5272802
github	www.github.com/WebReflection/flatted/security/advisories/GHSA-rf6f-7fwh-wjgh
github	www.github.com/WebReflection/flatted/releases/tag/v3.4.2

23 Mar 2026 19:14Current

6Medium risk

Vulners AI Score6

CVSS 3.19.8

CVSS 49.3

EPSS0.0007

SSVC

CWE-1321