HelixApplication · Apache
CVE-2023-38647
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 · uneditedAn attacker can use SnakeYAML to deserialize java.net.URLClassLoader and make it load a JAR from a specified URL, and then deserialize javax.script.ScriptEngineManager to load code using that ClassLoader. This unbounded deserialization can likely lead to remote code execution. The code can be run in Helix REST start and Workflow creation. Affect all the versions lower and include 1.2.0. Affected products: helix-core, helix-rest Mitigation: Short term, stop using any YAML based configuration and workflow creation. Long term, all Helix version bumping up to 1.3.0
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 · high confidenceThis is an unsafe deserialization vulnerability in SnakeYAML library used by Apache Helix. Attackers can deserialize java.net.URLClassLoader to load malicious JARs from arbitrary URLs, then deserialize javax.script.ScriptEngineManager to execute arbitrary code via that ClassLoader, achieving remote code execution. The attack surface is exposed through Helix REST service startup and workflow creation endpoints that accept YAML configuration.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
HelixApplication
< 1.3.0CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
-
Identify installed Apache Helix versionCheck your Helix installation directory for version metadata files, or query the Helix REST API endpoint /cluster/version if exposed, or inspect the helix-core JAR file manifestAffected if The installed Helix version is below 1.3.0
-
Locate SnakeYAML library in Helix dependenciesInspect the Helix runtime classpath or lib directory for the snakeyaml JAR file, or query your dependency management system (Maven POM, Gradle) for the snakeyaml versionAffected if SnakeYAML library version is below the patched version included in Helix 1.3.0
-
Verify Helix REST service is enabledCheck Helix configuration files (such as helix-config.json or cluster-config.xml) for REST service settings, or look for processes listening on Helix REST ports (typically 12345 or configured custom port)Affected if REST service is running and exposed on a network-accessible interface
-
Confirm YAML-based workflow creation is accessibleTest access to Helix workflow creation endpoints (POST to /workflows or similar YAML-input endpoints) or inspect configuration for workflow builder settings that accept YAML inputAffected if YAML workflow endpoints are accessible without additional authentication or are exposed to untrusted inputs
You are affected if Helix version is below 1.3.0 AND the REST service or YAML workflow endpoints are exposed and accepting external input.
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.
dbcve · scoped1.3.0
Immediately disable YAML-based configuration and workflow creation as a short-term workaround. Plan a dependency upgrade to Helix 1.3.0 which contains the patched SnakeYAML library, followed by comprehensive functional testing to verify no breaking changes.
1.3.0
- Upgrade helix-core dependency to version 1.3.0
- Upgrade helix-rest dependency to version 1.3.0
- Rebuild the application with updated dependencies
- Redeploy the updated application
- Verify that YAML-based configuration and workflow creation now use safe deserialization
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Helix
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing16.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $9,728.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-38647 — 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-2023-38647 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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.
- 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
- No spam, self-promotion, credentials, or personal data