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Vulnerability Database · npm · Package report

engine.io: vulnerability history, versions and safety

engine.io is a package in the npm ecosystem. Vulert records 7 vulnerabilities for it across 114 releases, from Jan 2022 to Sep 2026. Each vulnerability names the versions it affects, the fixed version to move to, and a workaround where no fix has been published.

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7 vulnerabilities recorded H5 M2
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0 with no fix published

Every vulnerability has a patched version to move to.

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3 in the last 12 months

Most recent disclosure 29 Sep 2026.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all engine.io vulnerabilities

Vulert verdict on engine.io 6.6.11 i

Updated on 23 Oct 2026

Good news: 6.6.11, the version you would install today, has no known vulnerabilities. Older releases do — the table below lists all 7.

Package health score 82/100
  • Security Some issues to review
  • Maintenance Sustainable
  • Popularity Key ecosystem project
  • Community Moderate

What to do: Stay on 6.6.11 or newer. This can change: a vulnerability disclosed tomorrow can affect 6.6.11 too — Vulert watches the package and alerts you if that happens. Monitor it with Vulert →

  • Current release 6.6.11 — unaffected i
  • Vulnerabilities on record 7 over 4 years · 3 in the last year i
  • Latest disclosure 29 Sep 2026 i
  • Highest CVSS 7.5 i
  • With no published fix 0 i
  • Depended on by 16,176 packages i
  • Stars 63,218 i
  • OpenSSF scorecard 5/10 i
  • Last release this month i
  • Licence MIT i

Version list, release dates, licence and dependants published by the npm registry, refreshed 23 Oct 2026. Licence information is not legal advice.

Concerned about your application's security?

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01 Versions

Which versions are affected

Every version Vulert tracks for engine.io, newest first, with the vulnerabilities recorded against each one. A version showing none has no vulnerability in the Vulert database — open it for the full picture on that release.

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Version Released Vulert vulnerabilities Licence Fix published Details
6.6.11 24 Sep 2026 none MIT — Details →
6.6.10 03 Sep 2026 none MIT — Details →
6.6.9 16 Jun 2026 H1 MIT Yes Details →
6.6.8 20 May 2026 H1 MIT Yes Details →
6.6.7 27 Apr 2026 H1 MIT Yes Details →
6.6.6 10 Mar 2026 H3 MIT Yes Details →
6.6.5 22 Dec 2025 H3 MIT Yes Details →
6.6.4 28 Jan 2025 H3 MIT Yes Details →
6.6.3 23 Jan 2025 H3 MIT Yes Details →
6.6.2 09 Oct 2024 H3 MIT Yes Details →
6.6.1 21 Sep 2024 H3 MIT Yes Details →
6.6.0 21 Jun 2024 H3 MIT Yes Details →
3.6.2 18 Jun 2024 none MIT — Details →
6.5.5 18 Jun 2024 H2 MIT Yes Details →
6.5.4 09 Nov 2023 H2 MIT Yes Details →
6.5.3 06 Oct 2023 H2 MIT Yes Details →
6.5.2 02 Aug 2023 H2 MIT Yes Details →
6.5.2-alpha.1 01 Aug 2023 H2 MIT Yes Details →
6.5.1 27 Jun 2023 H2 MIT Yes Details →
6.5.0 16 Jun 2023 H2 MIT Yes Details →
6.5.0-alpha.1 11 Jun 2023 H1 MIT Yes Details →
6.4.2 01 May 2023 H1 MIT Yes Details →
6.4.1 19 Feb 2023 H1 M1 MIT Yes Details →
6.4.0 06 Feb 2023 H1 M1 MIT Yes Details →
6.3.1 12 Jan 2023 H1 M1 MIT Yes Details →
6.3.0 10 Jan 2023 H1 M1 MIT Yes Details →
3.6.1 20 Nov 2022 none MIT — Details →
6.2.1 20 Nov 2022 H1 M1 MIT Yes Details →
3.6.0 06 Jun 2022 M1 MIT Yes Details →
6.2.0 17 Apr 2022 H1 M1 MIT Yes Details →
6.2.0-alpha.1 12 Mar 2022 H1 M1 MIT Yes Details →
6.1.3 23 Feb 2022 H1 M1 MIT Yes Details →
6.1.2 18 Jan 2022 H1 M1 MIT Yes Details →
5.2.1 11 Jan 2022 H1 M1 MIT Yes Details →
4.1.2 11 Jan 2022 H1 MIT Yes Details →
6.1.1 11 Jan 2022 H1 M1 MIT Yes Details →
6.1.0 08 Nov 2021 H1 M1 MIT Yes Details →
6.0.1 06 Nov 2021 H1 M1 MIT Yes Details →
6.0.0 08 Oct 2021 H1 M1 MIT Yes Details →
5.2.0 29 Aug 2021 H1 M1 MIT Yes Details →
5.1.1 16 May 2021 H1 M1 MIT Yes Details →
5.1.0 04 May 2021 H1 M1 MIT Yes Details →
5.0.0 10 Mar 2021 H1 MIT Yes Details →
4.1.1 02 Feb 2021 H2 MIT Yes Details →
4.1.0 14 Jan 2021 H2 MIT Yes Details →
4.0.6 04 Jan 2021 H1 MIT Yes Details →
3.5.0 30 Dec 2020 H1 M1 MIT Yes Details →
4.0.5 07 Dec 2020 H1 MIT Yes Details →
4.0.4 17 Nov 2020 H1 MIT Yes Details →
4.0.3 17 Nov 2020 H1 MIT Yes Details →
4.0.2 09 Nov 2020 H1 MIT Yes Details →
4.0.1 21 Oct 2020 H1 MIT Yes Details →
4.0.0 10 Sep 2020 H1 MIT Yes Details →
3.4.2 04 Jun 2020 H1 M1 MIT Yes Details →
3.4.1 17 Apr 2020 H1 M1 MIT Yes Details →
4.0.0-alpha.1 12 Feb 2020 none MIT — Details →
4.0.0-alpha.0 12 Feb 2020 none MIT — Details →
3.4.0 13 Sep 2019 H1 M1 MIT Yes Details →
3.3.2 29 Nov 2018 H1 M1 MIT Yes Details →
3.3.1 19 Nov 2018 H1 M1 MIT Yes Details →
3.3.0 07 Nov 2018 H1 M1 MIT Yes Details →
3.2.1 02 Nov 2018 H1 M1 MIT Yes Details →
3.2.0 28 Feb 2018 H1 M1 MIT Yes Details →
3.1.5 18 Feb 2018 H1 M1 MIT Yes Details →
1.8.5 27 Dec 2017 H1 M1 MIT Yes Details →
3.1.4 12 Nov 2017 H1 M1 MIT Yes Details →
3.1.3 11 Oct 2017 H1 M1 MIT Yes Details →
3.1.2 27 Sep 2017 H1 M1 MIT Yes Details →
3.1.1 02 Sep 2017 H1 M1 MIT Yes Details →
1.8.4 28 Apr 2017 H1 M1 MIT Yes Details →
3.1.0 27 Apr 2017 H1 M1 MIT Yes Details →
3.0.0 05 Apr 2017 H1 M1 MIT Yes Details →
2.1.1 22 Mar 2017 H1 M1 MIT Yes Details →
2.1.0 11 Mar 2017 H1 M1 MIT Yes Details →
1.8.3 16 Feb 2017 H1 M1 MIT Yes Details →
2.0.2 16 Feb 2017 H1 M1 MIT Yes Details →
2.0.1 30 Jan 2017 H1 M1 MIT Yes Details →
2.0.0 22 Jan 2017 H1 M1 MIT Yes Details →
1.8.2 10 Dec 2016 H1 M1 MIT Yes Details →
1.8.1 27 Nov 2016 H1 M1 MIT Yes Details →
1.8.0 20 Nov 2016 H1 M1 MIT Yes Details →
1.7.2 23 Oct 2016 H1 M1 MIT Yes Details →
1.7.1 20 Oct 2016 H1 M1 MIT Yes Details →
1.7.0 05 Oct 2016 H1 M1 MIT Yes Details →
1.6.11 24 Jun 2016 H1 M1 MIT Yes Details →
1.6.10 24 Jun 2016 H1 M1 MIT Yes Details →
1.6.9 03 May 2016 H1 M1 MIT Yes Details →
1.6.8 25 Jan 2016 H1 M1 MIT Yes Details →
1.6.7 11 Jan 2016 H1 M1 MIT Yes Details →
1.6.6 08 Jan 2016 H1 M1 MIT Yes Details →
1.6.5 05 Jan 2016 H1 M1 MIT Yes Details →
1.6.4 04 Dec 2015 H1 M1 MIT Yes Details →
1.6.3 01 Dec 2015 H1 M1 MIT Yes Details →
1.6.2 30 Nov 2015 H1 M1 MIT Yes Details →
1.6.1 29 Nov 2015 H1 M1 MIT Yes Details →
1.6.0 28 Nov 2015 H1 M1 MIT Yes Details →
1.5.4 09 Sep 2015 H1 M1 MIT Yes Details →
1.5.3 09 Sep 2015 H1 M1 MIT Yes Details →
1.5.2 09 Jul 2015 H1 M1 MIT Yes Details →
1.5.1 19 Jan 2015 H1 M1 MIT Yes Details →
1.5.0 18 Jan 2015 H1 M1 — Yes Details →
1.4.3 21 Nov 2014 H1 M1 — Yes Details →
1.4.2 27 Oct 2014 H1 M1 — Yes Details →
1.4.1 03 Oct 2014 H1 M1 — Yes Details →
1.4.0 03 Sep 2014 H1 M1 — Yes Details →
1.3.1 19 Jun 2014 H1 M1 — Yes Details →
1.3.0 13 Jun 2014 H1 M1 — Yes Details →
1.2.2 30 May 2014 H1 M1 — Yes Details →
1.2.1 22 May 2014 H1 M1 — Yes Details →
1.2.0 18 May 2014 H1 M1 — Yes Details →
1.1.1 14 May 2014 H1 M1 — Yes Details →
1.1.0 27 Apr 2014 H1 M1 — Yes Details →
1.0.5 18 Mar 2014 H1 M1 — Yes Details →
1.0.4 14 Mar 2014 H1 M1 — Yes Details →
1.0.3 12 Mar 2014 H1 M1 — Yes Details →
1.0.2 12 Mar 2014 H1 M1 — Yes Details →
1.0.1 06 Mar 2014 H1 M1 — Yes Details →
1.0.0 06 Mar 2014 H1 M1 — Yes Details →
0.9.0 09 Feb 2014 H1 M1 — Yes Details →
0.8.2 18 Jan 2014 H1 M1 — Yes Details →

The newest 120 of 161 versions Vulert tracks. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2022 3
  • 2023 1
  • 2026 3

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 3 of the 7 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for engine.io

The 5 most severe of 7 vulnerabilities recorded for this package

Search all 7 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
CVE-2022-21676: Uncaught Exception in engine.io 7.5 high 4.1.2 13 Jan 2022
CVE-2020-36048: Resource exhaustion in engine.io 7.5 high 3.6.0 09 Feb 2022
CVE-2026-59725: Engine.IO Denial of Service Vulnerability via Invalid Binary POST Requests 7.5 high 6.6.7 20 Jul 2026
CVE-2026-59724: Engine.IO Denial of Service Vulnerability via WebTransport SID 7.5 high 6.6.7 31 Aug 2026
CVE-2026-102599: Engine.IO Denial-of-Service Vulnerability in Socket.IO 7.5 high 6.6.10 29 Sep 2026

Vulnerability wrong, a fix missing, or a package we should cover? Report it and we will fix the record. Report Vulnerability Provide Feedback

Updated: 23/Oct/2026 · Vulnerabilities in our DB: 524315

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Questions

About engine.io

Is engine.io safe to use?

Vulert records 7 vulnerabilities for engine.io in npm: 0 critical, 5 high, 2 medium and 0 low. Every one of them has a published fix, so the practical answer is to run a supported release and keep it patched.

What is engine.io's Vulert package health score?

Vulert scores engine.io 82/100, which reads as in good shape. The score weighs the vulnerability record (40), maintenance and release cadence (25), adoption from dependents and stars (20) and community signals such as the OpenSSF scorecard and forks (15).

Is the latest version of engine.io affected?

No. 6.6.11, the version you would install today, has no vulnerabilities on record against it. Earlier releases do — the version table above lists each release with what affects it.

Which version of engine.io should I use?

6.6.11 is the version Vulert recommends for the affected releases. The version table above lists every release with the vulnerabilities recorded against it, so you can confirm the range you actually run.

How many vulnerabilities does engine.io have?

7 vulnerabilities are recorded for engine.io in the npm ecosystem: 0 critical, 5 high, 2 medium and 0 low. The ledger on this page lists the same counts next to the date of the most recent disclosure.

How often are new engine.io vulnerabilities disclosed?

3 vulnerabilities were recorded for engine.io in the last 12 months, and the oldest entry in this database dates to 13 Jan 2022. Recency matters more than a lifetime total: it shows how actively new issues are being disclosed for the package you are considering.

Which versions of engine.io are affected?

Each vulnerability on this page lists the affected version range and the fixed version to move to. Open the vulnerability for the version you actually run — fixes are specific to a release line, not to the package as a whole.

How do I monitor engine.io for upcoming vulnerabilities?

Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the engine.io version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.