CVE-2026-119051

MediumCVSS 5.9/10Last modified Nov 3, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-770

Affected software

Vendor	Product	Versions
hughsk	flat	<= 6.0.1

References

Timeline

Published: Oct 29, 2026
Last modified: Nov 3, 2026
NVD status: Deferred

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