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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| hughsk | flat | ≤ 6.0.1 | — |
References
- GitHub Issue #195 issue-tracking
- https://github.com/hughsk/flat product
- https://github.com/hughsk/flat/blob/1d68e1d06c0210cff31e5c61ac177f3e2d3fa564/index.js#L65-L75 technical-description
- https://github.com/hughsk/flat/blob/1d68e1d06c0210cff31e5c61ac177f3e2d3fa564/index.js#L137-L142 technical-description
- VulnCheck Advisory: flat through 6.0.1 Denial of Service via unflatten() Numeric Array Index Keys third-party-advisory