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BundlerApplication

CVE-2020-36327

HIGH · 8.8 CVSS v3.1 Published 2021-04-29
Fix available
A fix is available. Upgrade to 2.2.10 or later.
See remediation →
95/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.16 sometimes chooses a dependency source based on the highest gem version number, which means that a rogue gem found at a public source may be chosen, even if the intended choice was a private gem that is a dependency of another private gem that is explicitly depended on by the application. NOTE: it is not correct to use CVE-2021-24105 for every "Dependency Confusion" issue in every product.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
BundlerApplication
Affected:>= 1.16.0, < 2.2.10>= 2.2.11, <= 2.2.16
FedoraOperating system
Affected:= 34
Package Manager ConfigurationsApplication
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 2.2.10 or later
Fixed in 2.2.10
Vendor patch msrc.microsoft.com →
Recommended fix High confidence

Bundler 2.2.17 (or latest 2.x stable release); alternatively 2.2.10 addresses the immediate vulnerability

  1. 1. Check your current Bundler version by running: gem list bundler
  2. 2. Upgrade Bundler to version 2.2.10 or later (recommended: 2.2.17 or latest stable 2.x) using: gem install bundler -v '~> 2.2'
  3. 3. Verify the upgrade was successful: bundler --version
  4. 4. For Fedora 34 systems, ensure the system Bundler package is also updated: sudo dnf update rubygem-bundler
  5. 5. After upgrading, run bundle install to re-resolve all dependencies and confirm the correct sources are being used
  6. 6. Review your Gemfile and Gemfile.lock to ensure private gem sources are properly configured using the source directive or gem source blocks
Caveat Bundler 2.x introduced some behavioral changes from 1.x; if still on Bundler 1.16.x line, consider upgrading to 2.x as 1.x is no longer maintained

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-36327 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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