# postal-mime (npm) vulnerabilities

1 known vulnerability (1 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 4.2.0 (Oct 29, 2026): no advisory affects it
- Newest unaffected release: 4.2.0 (Oct 29, 2026), the latest release
- Weekly downloads: 17.2M
- Dependents: 75
- Releases: 73 since 1.0.0 (Jan 12, 2021)
- Registry: https://www.npmjs.com/package/postal-mime
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- GHSA-F2HQ-32VH-53CC: 3.0.0 to 4.0.7 (4.0.8 is outside it)

## Advisories (1)

### [GHSA-F2HQ-32VH-53CC](https://cve.now/GHSA-F2HQ-32VH-53CC): postal-mime: Quadratic CPU consumption when decoding a header of many joinable RFC 2047 base64 encoded words

- Severity: High
- Published: Oct 23, 2026
- Affected: from 3.0.0, fixed in 4.0.8.
- Fixed in 4.0.8 (released Oct 17, 2026, 6 days before disclosure).
- The latest release, 4.2.0, is not affected.
- 5.4% of postal-mime downloads last week were affected versions (1M).

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