What is CVE-2018-1051?

CVE-2018-1051 is a high-severity insecure deserialization vulnerability in org.jboss.resteasy:resteasy-yaml-provider (maven), affecting versions < 3.0.26.Final. It is fixed in 3.0.26.Final, 3.6.0.Final. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.

How severe is CVE-2018-1051?

CVE-2018-1051 has a CVSS score of 8.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of org.jboss.resteasy:resteasy-yaml-provider are affected by CVE-2018-1051?

org.jboss.resteasy:resteasy-yaml-provider (maven) versions < 3.0.26.Final is affected.

Is there a fix for CVE-2018-1051?

Yes. CVE-2018-1051 is fixed in 3.0.26.Final, 3.6.0.Final. Upgrade to this version or later.

Is CVE-2018-1051 exploitable, and should I be worried?

Whether CVE-2018-1051 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2018-1051 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

CVE-2018-1051

Q: How severe is CVE-2018-1051?

CVE-2018-1051 has a CVSS score of 8.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of org.jboss.resteasy:resteasy-yaml-provider are affected by CVE-2018-1051?

org.jboss.resteasy:resteasy-yaml-provider (maven) versions < 3.0.26.Final is affected.

Q: Is there a fix for CVE-2018-1051?

Yes. CVE-2018-1051 is fixed in 3.0.26.Final, 3.6.0.Final. Upgrade to this version or later.

Q: Is CVE-2018-1051 exploitable, and should I be worried?

Whether CVE-2018-1051 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2018-1051 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2018-1051?

Upgrade: org.jboss.resteasy:resteasy-yaml-provider to 3.0.26.Final or later, org.jboss.resteasy:resteasy-yaml-provider to 3.6.0.Final or later.

Summary

Deserialization of Untrusted Data in org.jboss.resteasy:resteasy-yaml-provider

It was found that the fix for CVE-2016-9606 in versions 3.0.22 and 3.1.2 was incomplete and Yaml unmarshalling in Resteasy is still possible via Yaml.load() in YamlProvider.

Mitigation:

If the YamlProvider is enabled it's recommended to add authentication, and authorization to the endpoint expecting Yaml content to prevent exploitation of this vulnerability.

Impact

Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect. Typical impact: arbitrary code execution or logic abuse.

CVE-2018-1051 has a CVSS score of 8.1 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (3.0.26.Final, 3.6.0.Final); upgrading removes the vulnerable code path.

Affected versions

org.jboss.resteasy:resteasy-yaml-provider (< 3.0.26.Final) org.jboss.resteasy:resteasy-yaml-provider (>= 3.1.0, < 3.6.0.Final)

Security releases

org.jboss.resteasy:resteasy-yaml-provider → 3.0.26.Final (maven) org.jboss.resteasy:resteasy-yaml-provider → 3.6.0.Final (maven)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade the following packages to resolve this vulnerability:

org.jboss.resteasy:resteasy-yaml-provider to 3.0.26.Final or later; org.jboss.resteasy:resteasy-yaml-provider to 3.6.0.Final or later

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2018-1051? CVE-2018-1051 is a high-severity insecure deserialization vulnerability in org.jboss.resteasy:resteasy-yaml-provider (maven), affecting versions < 3.0.26.Final. It is fixed in 3.0.26.Final, 3.6.0.Final. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.
How severe is CVE-2018-1051? CVE-2018-1051 has a CVSS score of 8.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of org.jboss.resteasy:resteasy-yaml-provider are affected by CVE-2018-1051? org.jboss.resteasy:resteasy-yaml-provider (maven) versions < 3.0.26.Final is affected.
Is there a fix for CVE-2018-1051? Yes. CVE-2018-1051 is fixed in 3.0.26.Final, 3.6.0.Final. Upgrade to this version or later.
Is CVE-2018-1051 exploitable, and should I be worried? Whether CVE-2018-1051 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2018-1051 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2018-1051?
- Upgrade org.jboss.resteasy:resteasy-yaml-provider to 3.0.26.Final or later
- Upgrade org.jboss.resteasy:resteasy-yaml-provider to 3.6.0.Final or later