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Vulnerability Database · npm · Package report

flat-cache: vulnerability history, versions and safety

flat-cache is a package in the npm ecosystem. Vulert records 1 vulnerability for it across 52 releases, first recorded in Aug 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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1 vulnerabilities recorded C1
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1 with no fix published

No patched version yet — these are the ones to plan around.

See the unfixed vulnerabilities →
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1 in the last 12 months

Most recent disclosure 04 Aug 2026.

See the disclosure history →
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1 malicious-package vulnerabilities

A published version contained malicious code.

See malicious packages in npm →

See all flat-cache vulnerabilities

Vulert verdict on flat-cache 6.1.23 i

Updated on 23 Oct 2026

Malicious package: every vulnerability Vulert records for flat-cache is a malicious-package vulnerability — a published version contained hostile code rather than a bug. Do not install it, and check whether it is already resolved in your dependencies.

Package health score 15/100
  • Security Malicious code published
  • Maintenance Sustainable
  • Popularity Key ecosystem project
  • Community Moderate

The current release contains malicious code, which caps this score.

What to do: Do not install this package. If it is already in your dependency tree, remove or replace it, and check what resolved it in the first place. Vulert keeps watching the name: if a maintained replacement appears, you will see it here. Monitor it with Vulert →

  • Current release 6.1.23 — affected i
  • Vulnerabilities on record 1 over 1 year · 1 in the last year i
  • Latest disclosure 04 Aug 2026 i
  • Highest CVSS n/a i
  • With no published fix 1 i
  • Malicious packages 1 i
  • Depended on by 3,946 packages i
  • Stars 2,011 i
  • Last release 3 months ago 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 flat-cache, 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
6.1.23 27 Jun 2026 C1 malicious MIT No Details →
6.1.22 27 Mar 2026 C1 malicious MIT No Details →
6.1.21 17 Mar 2026 C1 malicious MIT No Details →
6.1.20 17 Jan 2026 C1 malicious MIT No Details →
6.1.19 16 Nov 2025 C1 malicious MIT No Details →
6.1.18 13 Oct 2025 C1 malicious MIT No Details →
6.1.17 01 Oct 2025 C1 malicious MIT No Details →
6.1.14 16 Sep 2025 C1 malicious MIT No Details →
6.1.13 17 Aug 2025 C1 malicious MIT No Details →
6.1.12 23 Jul 2025 C1 malicious MIT No Details →
6.1.11 30 Jun 2025 C1 malicious MIT No Details →
6.1.10 08 Jun 2025 C1 malicious MIT No Details →
6.1.9 06 May 2025 C1 malicious MIT No Details →
6.1.8 05 Apr 2025 C1 malicious MIT No Details →
6.1.7 03 Mar 2025 C1 malicious MIT No Details →
6.1.6 27 Jan 2025 C1 malicious MIT No Details →
6.1.5 27 Dec 2024 C1 malicious MIT No Details →
6.1.4 12 Dec 2024 C1 malicious MIT No Details →
6.1.3 27 Nov 2024 C1 malicious MIT No Details →
6.1.2 10 Nov 2024 C1 malicious MIT No Details →
6.1.1 22 Oct 2024 C1 malicious MIT No Details →
6.1.0 29 Sep 2024 C1 malicious MIT No Details →
6.0.0 29 Sep 2024 C1 malicious MIT No Details →
5.0.0 24 May 2024 C1 malicious MIT No Details →
4.0.1 02 Mar 2024 C1 malicious MIT No Details →
4.0.0 18 Dec 2023 C1 malicious MIT No Details →
3.2.0 13 Nov 2023 C1 malicious MIT No Details →
3.1.1 06 Oct 2023 C1 malicious MIT No Details →
3.1.0 25 Aug 2023 C1 malicious MIT No Details →
3.0.4 08 Nov 2020 C1 malicious MIT No Details →
3.0.3 08 Nov 2020 C1 malicious MIT No Details →
3.0.2 08 Nov 2020 C1 malicious MIT No Details →
3.0.0 08 Nov 2020 C1 malicious MIT No Details →
2.0.1 09 Jan 2019 C1 malicious MIT No Details →
2.0.0 09 Jan 2019 C1 malicious MIT No Details →
1.3.4 14 Nov 2018 C1 malicious MIT No Details →
1.3.2 07 Nov 2018 C1 malicious MIT No Details →
1.3.1 06 Nov 2018 C1 malicious MIT No Details →
1.3.0 26 Sep 2017 C1 malicious MIT No Details →
1.2.2 20 Dec 2016 C1 malicious MIT No Details →
1.2.1 01 Aug 2016 C1 malicious MIT No Details →
1.2.0 01 Aug 2016 C1 malicious MIT No Details →
1.0.10 01 Nov 2015 C1 malicious MIT No Details →
1.0.9 11 Sep 2015 C1 malicious MIT No Details →
1.0.8 11 Sep 2015 C1 malicious MIT No Details →
1.0.7 11 Sep 2015 C1 malicious MIT No Details →
1.0.6 11 Sep 2015 C1 malicious MIT No Details →
1.0.4 30 Aug 2015 C1 malicious MIT No Details →
1.0.3 02 Mar 2015 C1 malicious MIT No Details →
1.0.2 02 Mar 2015 C1 malicious MIT No Details →
1.0.1 26 Feb 2015 C1 malicious MIT No Details →
1.0.0 26 Feb 2015 C1 malicious MIT No Details →

All 52 versions Vulert tracks for this package. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2026 1

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

03 Vulnerabilities

Recorded vulnerabilities for flat-cache

The 1 most severe of 1 vulnerabilities recorded for this package

Search all 1 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
Trojanized Release of flat-cache Package Exposes Credentials and Secrets N/A critical No fix published 04 Aug 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 flat-cache

Is flat-cache safe to use?

No. Vulert records a malicious-package vulnerability for flat-cache: a published version contained hostile code rather than a bug, and the package looks like one that was withdrawn for abuse. Do not install it, and check whether it is already resolved in your dependencies.

What is flat-cache's Vulert package health score?

Vulert scores flat-cache 15/100, which reads as critical. 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). The current release contains malicious code, which caps this score.

Is the latest version of flat-cache affected?

Yes. 6.1.23, the version you would install today, has 1 known vulnerability, and 1 has no published fix yet. Use an earlier unaffected release, or the workaround each vulnerability lists.

Which version of flat-cache should I use?

6.1.23 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 flat-cache have?

1 vulnerability is recorded for flat-cache in the npm ecosystem: 1 critical, 0 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 flat-cache vulnerabilities disclosed?

1 vulnerability was recorded for flat-cache in the last 12 months, and the oldest entry in this database dates to 04 Aug 2026. 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 flat-cache 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.

What does a malicious-package vulnerability mean?

It means the published package itself contained hostile code — a backdoor, a credential stealer or similar — rather than only a bug. Registries remove such packages once they are confirmed, so treat any application that resolved an affected version as compromised and rotate the credentials it could reach.

How do I monitor flat-cache for upcoming vulnerabilities?

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