# effect (npm) vulnerabilities

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

## At a glance

- Latest release: 4.1.2 (Nov 2, 2026): no advisory affects it
- Newest unaffected release: 4.1.2 (Nov 2, 2026), the latest release
- Weekly downloads: 66.8M
- Dependents: 422
- Releases: 497 since 2.0.0 (Jan 3, 2024)
- Registry: https://www.npmjs.com/package/effect
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-32887: 0.0.0-snapshot-0a6088b73485a0602ff216faac09f40877bc31d5 to 3.19.19 (3.20.0 is outside it)

## Advisories (1)

### [CVE-2026-32887](https://cve.now/CVE-2026-32887): Effect Bug: \`AsyncLocalStorage\` context lost/contaminated inside Effect fibers under concurrent load with RPC

- Severity: High 7.4
- Published: Mar 20, 2026
- Affected: fixed in 3.20.0.
- Fixed in 3.20.0 (released Mar 16, 2026, 4 days before disclosure).
- The latest release, 4.1.2, is not affected.
- 9% of effect downloads last week were affected versions (6.3M).

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