Is ansi-regex 4.0 vulnerable?

npm · 1 release from 4.0.0 to 4.0.0 · latest ansi-regex is 6.5.0 · checked 2 Nov 2026

Yes: 1 known advisory

Yes. ansi-regex 4.0.0, the last 4.0 release, is affected by 1 known security advisory (1 high), including CVE-2021-3807. Upgrade to 4.1.1 or later to fix all of them.

Upgrade with:npm install ansi-regex@4.1.1

Is your project affected?

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

Advisories affecting ansi-regex 4.0.0

  • HighCVE-2021-3807GHSA-93q8-gq69-wqmw20 Sept 2021

    Inefficient Regular Expression Complexity in chalk/ansi-regex

    Affected
    >=6.0.0 <6.0.1 · >=5.0.0 <5.0.1 · >=4.0.0 <4.1.1 · >=3.0.0 <3.0.1
    Fixed in
    3.0.1, 4.1.1, 5.0.1, 6.0.1

Which of your client projects are still on ansi-regex 4.0?

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

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Other ansi-regex 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.