Packages / undici / Security

HighVulnerabilityGHSA-38rv-x7px-6hhqPublished 18 Jun 2026

undici WebSocket client vulnerable to denial of service via cumulative fragment bypass

Affected · undici

  • >= 8.0.0, < 8.5.0

Fixed in

8.5.0

npm install undici@8.5.0

  1. Not affected

    0.1.0 – 7.30.1

    260 releases

  2. Affected

    8.0.0 – 8.4.1

    9 releases

  3. Fixed

    8.5.0 – 8.12.3

    15 releases, latest

284 stable releases of undici, oldest to newest.

What happens

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