Allocation of Resources Without Limits or Throttling Affecting flat package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-FLAT-22148819
- published3 Nov 2026
- disclosed29 Oct 2026
- creditYu Bao
Introduced: 29 Oct 2026
NewCVE-2026-119051 (opens in a new tab)How to fix?
There is no fixed version for flat.
Overview
flat is a Take a nested Javascript object and flatten it, or unflatten an object with delimited keys
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via unflatten(), which creates huge sparse arrays when processing flattened objects whose keys contain unbounded numeric indices. An attacker can supply keys such as a.4294967294, causing the resulting sparse array to consume excessive memory, and subsequent iteration with forEach, spread, or JSON.stringify to block the Node.js event loop.