Fabric8 KubernetesApplication · Redhat
CVE-2021-4178
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 · uneditedA arbitrary code execution flaw was found in the Fabric 8 Kubernetes client affecting versions 5.0.0-beta-1 and above. Due to an improperly configured YAML parsing, this will allow a local and privileged attacker to supply malicious YAML.
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 confidenceThe Fabric 8 Kubernetes client versions 5.0.0-beta-1 and above contains an improperly configured YAML parser that allows arbitrary code execution when processing malicious YAML. A local, privileged attacker can supply specially crafted YAML that gets deserialized unsafely, leading to code execution.
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
Fabric8 KubernetesApplication
>= 5.0.1, < 5.0.3>= 5.1.0, < 5.1.2>= 5.2.0, < 5.3.2>= 5.5.0, < 5.7.4>= 5.9.0, < 5.10.2>= 5.11.0, < 5.11.2= 5.0.0= 5.8.0
A Mq StreamsApplication
= 2.0.1
Build Of QuarkusApplication
= 2.2.5
Descision ManagerApplication
= 7.0
FuseApplication
= 7.11
Integration Camel KApplication
all versions
Integration Camel QuarkusApplication
= 2.2.1
Openshift Application RuntimesApplication
all versionsCVSS 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
- Local
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/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.
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Identify Fabric8 Kubernetes client versionCheck your project's dependency management (Maven pom.xml, Gradle build.gradle, or run 'mvn dependency:tree' / 'gradle dependencies') for the fabric8 kubernetes-client library versionAffected if The version falls within: 5.0.0, 5.0.1 to <5.0.3, 5.1.0 to <5.1.2, 5.2.0 to <5.3.2, 5.5.0 to <5.7.4, 5.8.0, 5.9.0 to <5.10.2, or 5.11.0 to <5.11.2
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Confirm YAML parsing is in useSearch codebase for YAML loading/parsing operations using the Kubernetes client (look for yaml.load(), YAML.load(), or similar calls with Config or resource definitions)Affected if Your application parses YAML files or strings using the Fabric8 Kubernetes client library
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Verify YAML parser configurationInspect YAML parsing code to determine if SafeConstructor or safe deserialization is configured. Look for YAML instances created without explicit safe constructorsAffected if The YAML parser is configured with the default unsafe constructor (no SafeConstructor, SafeRepresenter, or SafeLoader explicitly set)
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Check Red Hat product versionsIf using Red Hat Fuse, AMQ Streams, Quarkus, Decision Manager, or Camel products, identify the specific product version from your installationAffected if Product version matches: Fabric8 5.0.1-5.0.2, 5.1.1, 5.2.0-5.3.1, 5.5.0-5.7.3, 5.8.0, 5.9.0-5.10.1, 5.11.0-5.11.1; AMQ Streams 2.0.1; Quarkus 2.2.5; Decision Manager 7.0; Fuse 7.11; Camel K any version; Camel Quarkus 2.2.1; OpenShift Application Runtimes any version
You are affected if your environment uses a Fabric8 Kubernetes client version within the affected ranges AND your application processes untrusted YAML using the default unsafe deserialization configuration.
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 · scoped5.0.35.1.25.3.2
Configure YAML parser to use safe deserialization (e.g., SafeConstructor) and update to the latest patched version of the Fabric 8 Kubernetes client when available.
Fabric8 Kubernetes client 5.0.3, 5.1.2, 5.3.2, or 5.7.4 depending on the current major.minor branch in use
- 1. Identify the current Fabric8 Kubernetes client version in use by examining project dependencies (e.g., pom.xml, build.gradle, or package.json)
- 2. Based on the current major.minor version, upgrade to the corresponding fixed release: for 5.0.x upgrade to 5.0.3, for 5.1.x upgrade to 5.1.2, for 5.2.x upgrade to 5.3.2, or for 5.5.x upgrade to 5.7.4
- 3. Update the dependency version in the project's build configuration file
- 4. Rebuild and test the application to ensure the upgrade does not break existing functionality
- 5. If using Red Hat middleware products (AMQ Streams, Decision Manager, Fuse, Camel K, Camel Quarkus, or OpenShift Application Runtimes), verify the product's own security advisories for patched container images that include the fixed Fabric8 version
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Fabric8 Kubernetes
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-4178 — 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-2021-4178 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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- Version or environment caveats, and links to real fixes
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