StackPrism

npm package

express 4.21.0: no known vulnerabilities

express 4.21.0 has no known vulnerabilities in OSV.dev.

npm (opens in a new tab) describes it as “Fast, unopinionated, minimalist web framework”

Known vulnerabilities
0
None in OSV.dev
Released
Sep 11, 2024
Latest is 5.3.0
Downloads last week
446.1K
Under 1% of express downloads
Express 4 support
Supported
Licence
MIT
OpenSSF Scorecard
8.5/10
expressjs/express (opens in a new tab)
Pulls in
71 packages
Resolved by deps.dev

Newer releases

4.21.0 has nothing to fix today. Newer releases, for when you upgrade:

  • 4.22.3

    Newest 4.x release. Released Sep 14, 2026.

    No known vulnerabilities

  • 5.3.0

    Latest release. Released Oct 9, 2026.

    No known vulnerabilities

Findings

Who is still on a vulnerable express

7% of last week’s 145.2M express downloads went to versions with known vulnerabilities.

From npm’s per-version download counts for the last 7 days, each version checked against OSV.dev. The versions checked cover over 99% of downloads.

Is express the only one?

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How this page is checked

StackPrism asks OSV.dev which advisories affect exactly express 4.21.0, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and npm, support dates from endoflife.date. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against npm, OSV.dev, deps.dev and endoflife.date.