# flatted (npm) vulnerabilities

2 known vulnerabilities (2 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 3.4.4 (Jul 30, 2026): no advisory affects it
- Newest unaffected release: 3.4.4 (Jul 30, 2026), the latest release
- Weekly downloads: 199.4M
- Dependents: 84.7K
- Releases: 44 since 0.1.0 (Apr 26, 2018)
- Registry: https://www.npmjs.com/package/flatted
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-33228: 0.1.0 to 3.4.1 (3.4.2 is outside it)
- CVE-2026-32141: 0.1.0 to 3.3.4 (3.4.0 is outside it)

## Advisories (2)

### [CVE-2026-33228](https://cve.now/CVE-2026-33228): flatted: Prototype Pollution via parse()

- Severity: High 8.9
- Published: Mar 20, 2026
- Affected: fixed in 3.4.2.
- Fixed in 3.4.2 (released Mar 17, 2026, 3 days before disclosure).
- The latest release, 3.4.4, is not affected.
- 28% of flatted downloads last week were affected versions (63.4M).

### [CVE-2026-32141](https://cve.now/CVE-2026-32141): flatted: Unbounded recursion DoS in parse() revive phase

- Severity: High 7.5
- Published: Mar 12, 2026
- Affected: fixed in 3.4.0.
- Fixed in 3.4.0 (released Mar 8, 2026, 4 days before disclosure).
- The latest release, 3.4.4, is not affected.
- 28% of flatted downloads last week were affected versions (61.8M).

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