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Vulnerability Database · npm · Package report

engine.io-client: vulnerability history, versions and safety

engine.io-client is a package in the npm ecosystem. Vulert records 1 vulnerability for it across 30 releases, first recorded in Feb 2019. 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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1 vulnerabilities recorded M1
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0 with no fix published

Every vulnerability has a patched version to move to.

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0 in the last 12 months

Nothing new recorded in the last year.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all engine.io-client vulnerabilities

Vulert verdict on engine.io-client 6.6.7 i

Updated on 23 Oct 2026

Good news: 6.6.7, the version you would install today, has no known vulnerabilities. Older releases do — the table below lists all 1.

Package health score 90/100
  • Security Minor issues
  • Maintenance Sustainable
  • Popularity Key ecosystem project
  • Community Moderate

What to do: Stay on 6.6.7 or newer. This can change: a vulnerability disclosed tomorrow can affect 6.6.7 too — Vulert watches the package and alerts you if that happens. Monitor it with Vulert →

  • Current release 6.6.7 — unaffected i
  • Vulnerabilities on record 1 over 1 year · 0 in the last year i
  • Latest disclosure 18 Feb 2019 i
  • Highest CVSS 5.9 i
  • With no published fix 0 i
  • Depended on by 20,427 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.

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01 Versions

Which versions are affected

Every version Vulert tracks for engine.io-client, 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
6.6.7 25 Sep 2026 none MIT — Details →
6.6.6 16 Jun 2026 none MIT — Details →
6.6.5 20 May 2026 none MIT — Details →
6.6.4 23 Dec 2025 none MIT — Details →
3.5.6 19 Dec 2025 none MIT — Details →
3.5.5 17 Nov 2025 none MIT — Details →
6.6.3 23 Jan 2025 none MIT — Details →
6.6.2 23 Oct 2024 none MIT — Details →
6.6.1 21 Sep 2024 none MIT — Details →
6.6.0 21 Jun 2024 none MIT — Details →
3.5.4 18 Jun 2024 none MIT — Details →
6.5.4 18 Jun 2024 none MIT — Details →
6.5.3 09 Nov 2023 none MIT — Details →
6.5.2 01 Aug 2023 none MIT — Details →
6.5.1 28 Jun 2023 none MIT — Details →
6.5.0 16 Jun 2023 none MIT — Details →
6.4.0 06 Feb 2023 none MIT — Details →
6.3.1 04 Feb 2023 none MIT — Details →
6.3.0 10 Jan 2023 none MIT — Details →
6.2.3 13 Oct 2022 none MIT — Details →
3.5.3 07 Sep 2022 none MIT — Details →
6.2.2 02 May 2022 none MIT — Details →
6.2.1 17 Apr 2022 none MIT — Details →
6.2.0 17 Apr 2022 none MIT — Details →
6.0.3 14 Nov 2021 none MIT — Details →
6.1.1 14 Nov 2021 none MIT — Details →
6.1.0 08 Nov 2021 none MIT — Details →
6.0.2 15 Oct 2021 none MIT — Details →
6.0.1 14 Oct 2021 none MIT — Details →
6.0.0 08 Oct 2021 none MIT — Details →
5.2.0 29 Aug 2021 none MIT — Details →
3.3.3 28 Jul 2021 none MIT — Details →
1.8.6 28 Jun 2021 none MIT — Details →
5.1.2 24 Jun 2021 none MIT — Details →
5.1.1 11 May 2021 none MIT — Details →
4.1.4 05 May 2021 none MIT — Details →
3.5.2 05 May 2021 none MIT — Details →
5.1.0 04 May 2021 none MIT — Details →
4.1.3 31 Mar 2021 none MIT — Details →
5.0.1 31 Mar 2021 none MIT — Details →
5.0.0 10 Mar 2021 none MIT — Details →
3.5.1 02 Mar 2021 none MIT — Details →
4.1.2 25 Feb 2021 none MIT — Details →
4.1.1 02 Feb 2021 none MIT — Details →
4.1.0 14 Jan 2021 none MIT — Details →
4.0.6 04 Jan 2021 none MIT — Details →
3.5.0 30 Dec 2020 none MIT — Details →
4.0.5 07 Dec 2020 none MIT — Details →
4.0.4 17 Nov 2020 none MIT — Details →
4.0.3 17 Nov 2020 none MIT — Details →
4.0.2 09 Nov 2020 none MIT — Details →
4.0.1 21 Oct 2020 none MIT — Details →
3.4.4 30 Sep 2020 none MIT — Details →
4.0.0 10 Sep 2020 none MIT — Details →
3.4.3 04 Jun 2020 none MIT — Details →
3.4.2 13 May 2020 none MIT — Details →
3.4.1 17 Apr 2020 none MIT — 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 none MIT — Details →
3.3.2 20 Jan 2019 none MIT — Details →
3.3.1 19 Nov 2018 none MIT — Details →
3.3.0 07 Nov 2018 none MIT — Details →
3.1.6 09 Mar 2018 none MIT — Details →
3.2.1 09 Mar 2018 none MIT — Details →
3.2.0 28 Feb 2018 none MIT — Details →
3.1.5 18 Feb 2018 none MIT — Details →
1.8.5 27 Dec 2017 none MIT — Details →
3.1.4 12 Nov 2017 none MIT — Details →
3.1.3 11 Oct 2017 none MIT — Details →
3.1.2 27 Sep 2017 none MIT — Details →
3.1.1 19 May 2017 none MIT — Details →
1.8.4 28 Apr 2017 none MIT — Details →
3.1.0 27 Apr 2017 none MIT — Details →
3.0.0 05 Apr 2017 none MIT — Details →
2.1.1 22 Mar 2017 none MIT — Details →
2.1.0 11 Mar 2017 none MIT — Details →
1.8.3 16 Feb 2017 none MIT — Details →
2.0.2 16 Feb 2017 none MIT — Details →
2.0.1 30 Jan 2017 none MIT — Details →
2.0.0 22 Jan 2017 none MIT — Details →
1.8.2 10 Dec 2016 none MIT — Details →
1.8.1 27 Nov 2016 none MIT — Details →
1.8.0 20 Nov 2016 none MIT — Details →
1.7.2 23 Oct 2016 none MIT — Details →
1.7.1 20 Oct 2016 none MIT — Details →
1.7.0 05 Oct 2016 none MIT — Details →
1.6.11 24 Jun 2016 none MIT — Details →
1.6.10 24 Jun 2016 none MIT — Details →
1.6.9 03 May 2016 none MIT — Details →
1.6.8 25 Jan 2016 M1 MIT Yes Details →
1.6.7 11 Jan 2016 M1 MIT Yes Details →
1.6.6 08 Jan 2016 M1 MIT Yes Details →
1.6.5 05 Jan 2016 M1 MIT Yes Details →
1.6.4 04 Dec 2015 M1 MIT Yes Details →
1.6.3 01 Dec 2015 M1 MIT Yes Details →
1.6.2 30 Nov 2015 M1 MIT Yes Details →
1.6.1 29 Nov 2015 M1 MIT Yes Details →
1.6.0 28 Nov 2015 M1 MIT Yes Details →
1.5.4 09 Sep 2015 M1 MIT Yes Details →
1.5.3 09 Sep 2015 M1 — Yes Details →
1.5.2 09 Jul 2015 M1 — Yes Details →
1.5.1 19 Jan 2015 M1 — Yes Details →
1.5.0 18 Jan 2015 M1 — Yes Details →
1.4.3 21 Nov 2014 M1 — Yes Details →
1.4.2 27 Oct 2014 M1 — Yes Details →
1.4.1 03 Oct 2014 M1 — Yes Details →
1.4.0 03 Sep 2014 M1 — Yes Details →
1.3.1 19 Jun 2014 M1 — Yes Details →
1.3.0 13 Jun 2014 M1 — Yes Details →
1.2.2 30 May 2014 M1 — Yes Details →
1.2.1 22 May 2014 M1 — Yes Details →
1.2.0 18 May 2014 M1 — Yes Details →
1.1.1 14 May 2014 M1 — Yes Details →
1.1.0 27 Apr 2014 M1 — Yes Details →
1.0.5 18 Mar 2014 M1 — Yes Details →
1.0.4 14 Mar 2014 M1 — Yes Details →
1.0.3 12 Mar 2014 M1 — Yes Details →
1.0.2 12 Mar 2014 M1 — Yes Details →
1.0.1 06 Mar 2014 M1 — Yes Details →

The newest 120 of 166 versions Vulert tracks. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2019 1

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 0 of the 1 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for engine.io-client

The 1 most severe of 1 vulnerabilities recorded for this package

Search all 1 in the database →
Vulnerability Severity Fixed version ↑ Disclosed ↑
CVE-2016-10536: Insecure Defaults Allow MITM Over TLS in engine.io-client 5.9 medium 1.6.9 18 Feb 2019

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-client

Is engine.io-client safe to use?

Vulert records 1 vulnerabilities for engine.io-client in npm: 0 critical, 0 high, 1 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-client's Vulert package health score?

Vulert scores engine.io-client 90/100, which reads as healthy. 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-client affected?

No. 6.6.7, 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-client should I use?

6.6.7 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-client have?

1 vulnerability is recorded for engine.io-client in the npm ecosystem: 0 critical, 0 high, 1 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-client vulnerabilities disclosed?

0 vulnerabilities were recorded for engine.io-client in the last 12 months, and the oldest entry in this database dates to 18 Feb 2019. 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-client 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-client for upcoming vulnerabilities?

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