Summary
fast-fault has a segmentation fault due to lack of bound check
In this case, the "fast_float::common::AsciiStr::first" method within the "AsciiStr" struct
uses the unsafe keyword to reading from memory without performing bounds checking.
Specifically, it directly dereferences a pointer offset by "self.ptr".
Because of the above reason, the method accesses invalid memory address when it takes an empty string as its input.
This approach violates Rust’s memory safety guarantees, as it can lead to invalid memory access if empty buffer is provided.
No patched version for fast-float crate has been released, but a patch is available in the fast-float2 fork.
Impact
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-8655-XGH5-5VVQ? GHSA-8655-XGH5-5VVQ is a medium-severity security vulnerability in fast-float (rust), affecting versions <= 0.2.0. No fixed version is listed yet.
- Which versions of fast-float are affected by GHSA-8655-XGH5-5VVQ? fast-float (rust) versions <= 0.2.0 is affected.
- Is there a fix for GHSA-8655-XGH5-5VVQ? No fixed version is listed for GHSA-8655-XGH5-5VVQ yet. Monitor the advisory for updates and apply mitigations in the interim.
- Is GHSA-8655-XGH5-5VVQ exploitable, and should I be worried? Whether GHSA-8655-XGH5-5VVQ 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-8655-XGH5-5VVQ 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.