flat through 6.0.1 contains an uncontrolled resource allocation vulnerability in unflatten() that allows attackers to create huge sparse arrays via unbounded numeric keys. Attackers can supply flattened keys such as a.4294967294, causing iteration with forEach, spread or JSON.stringify to block the Node.js event loop.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 29 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Description flat through 6.0.1 contains an uncontrolled resource allocation vulnerability in unflatten() that allows attackers to create huge sparse arrays via unbounded numeric keys. Attackers can supply flattened keys such as a.4294967294, causing iteration with forEach, spread or JSON.stringify to block the Node.js event loop.
Title flat through 6.0.1 Denial of Service via unflatten() Numeric Array Index Keys
First Time appeared Flat Project
Flat Project flat
Weaknesses CWE-770
CPEs cpe:2.3:a:flat_project:flat:*:*:*:*:*:*:*:*
Vendors & Products Flat Project
Flat Project flat
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-29T13:08:52.215Z

Reserved: 2026-10-29T11:51:51.276Z

Link: CVE-2026-119051

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-29T14:17:52.157

Modified: 2026-10-29T16:21:34.310

Link: CVE-2026-119051

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T15:45:06Z

Weaknesses