# altcha (npm) vulnerabilities

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

## At a glance

- Latest release: 3.5.0 (Oct 22, 2026): no advisory affects it
- Newest unaffected release: 3.5.0 (Oct 22, 2026), the latest release
- Weekly downloads: 271K
- Dependents: 16
- Releases: 110 since 0.1.0 (Nov 18, 2023)
- Registry: https://www.npmjs.com/package/altcha
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2025-65849: 0.8.0 to 2.2.4 (2.3.0 is outside it)

## Advisories (1)

### [CVE-2025-65849](https://cve.now/CVE-2025-65849): A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the…

- Severity: Critical 9.1
- Published: Dec 8, 2025
- Affected: from 0.8.0, through 2.2.4.
- Fixed in 2.3.0 (released Dec 18, 2025, 10 days after disclosure), the first release outside every affected range (no listed fixed version clears them all).
- The latest release, 3.5.0, is not affected.
- 4.8% of altcha downloads last week were affected versions (15.4K).

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