Is css-what 4.0 vulnerable?

npm · 1 release from 4.0.0 to 4.0.0 · latest css-what is 8.0.0 · checked 1 Nov 2026

Yes: 1 known advisory

Yes. css-what 4.0.0, the last 4.0 release, is affected by 1 known security advisory (1 high), including CVE-2021-33587. Upgrade to 5.0.1 or later to fix all of them.

Upgrade with:npm install css-what@5.0.1

Is your project affected?

Private repo? Upload its lockfile instead, or connect GitHub to check every repo.

Advisories affecting css-what 4.0.0

  • HighCVE-2021-33587GHSA-q8pj-2vqx-8ggc7 Jun 2021

    Denial of service in css-what

    Affected
    >=4.0.0 <5.0.1
    Fixed in
    5.0.1

Which of your client projects are still on css-what 4.0?

NPMscan reads the lockfiles in every GitHub repo you pick, finds the exact css-what version each one installs, and checks it against these advisories. Each finding comes with the command that fixes it.

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Other css-what versions

Advisory data from OSV.dev (opens OSV.dev in a new tab), which includes the GitHub Advisory Database. Release list from the npm registry. Refreshed daily.