Summary
Laravel Cookie serialization vulnerability
Laravel 5.6.30 is a security release of Laravel and is recommended as an immediate upgrade for all users. Laravel 5.6.30 also contains a breaking change to cookie encryption and serialization logic. Refer to laravel advisory for more details and read the notes carefully when upgrading your application.
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.
Affected versions
Security releases
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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Frequently Asked Questions
- What is GHSA-6JVX-8CH9-J2JR? GHSA-6JVX-8CH9-J2JR is a high-severity insecure deserialization vulnerability in laravel/framework (composer), affecting versions >= 5.5.0, < 5.6.30. It is fixed in 5.6.30. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.
- Which versions of laravel/framework are affected by GHSA-6JVX-8CH9-J2JR? laravel/framework (composer) versions >= 5.5.0, < 5.6.30 is affected.
- Is there a fix for GHSA-6JVX-8CH9-J2JR? Yes. GHSA-6JVX-8CH9-J2JR is fixed in 5.6.30. Upgrade to this version or later.
- Is GHSA-6JVX-8CH9-J2JR exploitable, and should I be worried? Whether GHSA-6JVX-8CH9-J2JR 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 GHSA-6JVX-8CH9-J2JR 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 GHSA-6JVX-8CH9-J2JR? Upgrade
laravel/frameworkto 5.6.30 or later.