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.
Published: 2026-10-29
Score: 8.2 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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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'}

Subscriptions

Flat Project Flat
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 : Received

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

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

Link: CVE-2026-119051

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-770

    Allocation of Resources Without Limits or Throttling