CVE-2023-27531
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 · uneditedThere is a deserialization of untrusted data vulnerability in the Kredis JSON deserialization code
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 · moderate confidenceThis is a deserialization vulnerability in Kredis, a Ruby gem that provides Redis data structures for Rails applications. The issue allows deserialization of untrusted data through the JSON deserialization code, potentially leading to object injection or arbitrary code execution depending on the application's Ruby objects being deserialized.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if Kredis gem is presentCheck your Gemfile, Gemfile.lock, or run `gem list kredis` to see if the Kredis gem is installed in your Rails applicationAffected if Kredis gem is not present in the application dependencies
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Determine installed Kredis versionRun `bundle show kredis` or check the version line in Gemfile.lock to obtain the exact installed version numberAffected if The installed version falls within the vulnerable version range for this CVE (check against released patch versions)
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Check for Kredis JSON deserialization usageSearch your codebase for calls to Kredis methods that perform JSON deserialization, such as `Kredis::Json` or any custom deserialization wrappers around KredisAffected if The application code uses Kredis JSON deserialization features with data that could originate from untrusted sources
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Audit data sources feeding Kredis deserializationReview application code paths where JSON data is parsed or deserialized via Kredis, including API endpoints, message queues, or external service integrationsAffected if Untrusted or user-supplied JSON data can reach Kredis deserialization methods without validation
You are affected if Kredis is installed and your application uses its JSON deserialization features with data from untrusted sources.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataUpgrade to the patched version of Kredis when available, or implement strict input validation on any JSON data before passing it to Kredis deserialization methods. If using custom JSON decoders, ensure only expected object types are permitted.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2023-27531 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-27531 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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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