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Vulnerability Database · npm · Package report

merge-deep: vulnerability history, versions and safety

merge-deep is a package in the npm ecosystem. Vulert records 2 vulnerabilities for it across 15 releases, from Jul 2018 to Jun 2021. 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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2 vulnerabilities recorded C1 H1
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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 merge-deep vulnerabilities

Vulert verdict on merge-deep 3.0.3 i

Updated on 23 Oct 2026

Good news: 3.0.3, the version you would install today, has no known vulnerabilities. Older releases do — the table below lists all 2.

Package health score 58/100
  • Security Some issues to review
  • Maintenance Slowing
  • Popularity Widely used
  • Community Inactive

What to do: Stay on 3.0.3 or newer. This can change: a vulnerability disclosed tomorrow can affect 3.0.3 too — Vulert watches the package and alerts you if that happens. Monitor it with Vulert →

  • Current release 3.0.3 — unaffected i
  • Vulnerabilities on record 2 over 2 years · 0 in the last year i
  • Latest disclosure 07 Jun 2021 i
  • Highest CVSS 9.8 i
  • With no published fix 0 i
  • Depended on by 12,899 packages i
  • Stars 109 i
  • OpenSSF scorecard 1/10 i
  • Last release 69 months ago i
  • Licence MIT i
  • Similar names deepmerge 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 merge-deep, 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
3.0.3 11 Jan 2021 none MIT — Details →
3.0.2 11 Jul 2018 C1 MIT Yes Details →
3.0.1 07 Feb 2018 C1 MIT Yes Details →
3.0.0 13 Apr 2016 C1 H1 MIT Yes Details →
2.0.2 23 Dec 2015 C1 H1 MIT Yes Details →
2.0.1 21 Aug 2015 C1 H1 MIT Yes Details →
2.0.0 29 Jun 2015 C1 H1 MIT Yes Details →
1.0.3 13 Jun 2015 C1 H1 MIT Yes Details →
1.0.2 28 May 2015 C1 H1 MIT Yes Details →
1.0.1 25 Feb 2015 C1 H1 MIT Yes Details →
1.0.0 25 Feb 2015 C1 H1 MIT Yes Details →
0.1.5 19 Feb 2015 C1 H1 MIT Yes Details →
0.1.4 19 Feb 2015 C1 H1 MIT Yes Details →
0.1.3 04 Nov 2014 C1 H1 MIT Yes Details →
0.1.2 08 Oct 2014 C1 H1 MIT Yes Details →
0.1.0 03 Oct 2014 C1 H1 MIT Yes Details →

All 16 versions Vulert tracks for this package. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2018 1
  • 2021 1

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 0 of the 2 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for merge-deep

The 2 most severe of 2 vulnerabilities recorded for this package

Search all 2 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
CVE-2021-26707: Prototype Pollution in merge-deep 9.8 critical 3.0.3 07 Jun 2021
CVE-2018-3722: Prototype Pollution in merge-deep 8.8 high 3.0.1 26 Jul 2018

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 merge-deep

Is merge-deep safe to use?

Vulert records 2 vulnerabilities for merge-deep in npm: 1 critical, 1 high, 0 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 merge-deep's Vulert package health score?

Vulert scores merge-deep 58/100, which reads as usable, but worth attention. 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 merge-deep affected?

No. 3.0.3, 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 merge-deep should I use?

3.0.3 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 merge-deep have?

2 vulnerabilities are recorded for merge-deep in the npm ecosystem: 1 critical, 1 high, 0 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 merge-deep vulnerabilities disclosed?

0 vulnerabilities were recorded for merge-deep in the last 12 months, and the oldest entry in this database dates to 26 Jul 2018. 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 merge-deep 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 merge-deep for upcoming vulnerabilities?

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