What is GHSA-WWQ9-3CPR-MM53?

GHSA-WWQ9-3CPR-MM53 is a high-severity insecure deserialization vulnerability in hashbrown (rust), affecting versions >= 0.15.0, < 0.15.1. It is fixed in 0.15.1. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.

Which versions of hashbrown are affected by GHSA-WWQ9-3CPR-MM53?

hashbrown (rust) versions >= 0.15.0, < 0.15.1 is affected.

Is there a fix for GHSA-WWQ9-3CPR-MM53?

Yes. GHSA-WWQ9-3CPR-MM53 is fixed in 0.15.1. Upgrade to this version or later.

Is GHSA-WWQ9-3CPR-MM53 exploitable, and should I be worried?

Whether GHSA-WWQ9-3CPR-MM53 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 GHSA-WWQ9-3CPR-MM53 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.

GHSA-WWQ9-3CPR-MM53 in hashbrown

Q: Which versions of hashbrown are affected by GHSA-WWQ9-3CPR-MM53?

hashbrown (rust) versions >= 0.15.0, < 0.15.1 is affected.

Q: Is there a fix for GHSA-WWQ9-3CPR-MM53?

Yes. GHSA-WWQ9-3CPR-MM53 is fixed in 0.15.1. Upgrade to this version or later.

Q: Is GHSA-WWQ9-3CPR-MM53 exploitable, and should I be worried?

Whether GHSA-WWQ9-3CPR-MM53 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 GHSA-WWQ9-3CPR-MM53 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 GHSA-WWQ9-3CPR-MM53?

Upgrade hashbrown to 0.15.1 or later.

Summary

Borsh serialization of HashMap is non-canonical

The borsh serialization of the HashMap did not follow the borsh specification. It potentially produced non-canonical encodings dependent on insertion order. It also did not perform canonicty checks on decoding.

This can result in consensus splits and cause equivalent objects to be considered distinct.

This was patched in 0.15.1.

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

hashbrown (>= 0.15.0, < 0.15.1)

Security releases

hashbrown → 0.15.1 (rust)

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 hashbrown to 0.15.1 or later to resolve this vulnerability.

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

Frequently Asked Questions

What is GHSA-WWQ9-3CPR-MM53? GHSA-WWQ9-3CPR-MM53 is a high-severity insecure deserialization vulnerability in hashbrown (rust), affecting versions >= 0.15.0, < 0.15.1. It is fixed in 0.15.1. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.
Which versions of hashbrown are affected by GHSA-WWQ9-3CPR-MM53? hashbrown (rust) versions >= 0.15.0, < 0.15.1 is affected.
Is there a fix for GHSA-WWQ9-3CPR-MM53? Yes. GHSA-WWQ9-3CPR-MM53 is fixed in 0.15.1. Upgrade to this version or later.
Is GHSA-WWQ9-3CPR-MM53 exploitable, and should I be worried? Whether GHSA-WWQ9-3CPR-MM53 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-WWQ9-3CPR-MM53 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-WWQ9-3CPR-MM53? Upgrade hashbrown to 0.15.1 or later.