What is GHSA-C2HM-MJXV-89R4?

GHSA-C2HM-MJXV-89R4 is a low-severity security vulnerability in lexical (rust), affecting versions <= 6.1.1. It is fixed in 7.0.0.

Which versions of lexical are affected by GHSA-C2HM-MJXV-89R4?

lexical (rust) versions <= 6.1.1 is affected.

Is there a fix for GHSA-C2HM-MJXV-89R4?

Yes. GHSA-C2HM-MJXV-89R4 is fixed in 7.0.0. Upgrade to this version or later.

Is GHSA-C2HM-MJXV-89R4 exploitable, and should I be worried?

Whether GHSA-C2HM-MJXV-89R4 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-C2HM-MJXV-89R4 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-C2HM-MJXV-89R4 in lexical

Q: Which versions of lexical are affected by GHSA-C2HM-MJXV-89R4?

lexical (rust) versions <= 6.1.1 is affected.

Q: Is there a fix for GHSA-C2HM-MJXV-89R4?

Yes. GHSA-C2HM-MJXV-89R4 is fixed in 7.0.0. Upgrade to this version or later.

Q: Is GHSA-C2HM-MJXV-89R4 exploitable, and should I be worried?

Whether GHSA-C2HM-MJXV-89R4 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-C2HM-MJXV-89R4 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-C2HM-MJXV-89R4?

Upgrade lexical to 7.0.0 or later.

Summary

Multiple soundness issues in lexical

lexical contains multiple soundness issues:

Bytes::read() allows creating instances of types with invalid bit patterns
BytesIter::read() advances iterators out of bounds
The BytesIter trait has safety invariants but is public and not marked unsafe
write_float() calls MaybeUninit::assume_init() on uninitialized data, which is is not allowed by the Rust abstract machine
radix() calls MaybeUninit::assume_init() on uninitialized data, which is is not allowed by the Rust abstract machine

The crate also has some correctness issues.

Alternatives

For quickly parsing floating-point numbers third-party crates are no longer needed. A fast float parsing algorithm by the author of lexical has been merged into libcore.

For quickly parsing integers, consider atoi and btoi crates (100% safe code). atoi_radix10 provides even faster parsing, but only with -C target-cpu=native, and at the cost of some unsafe.

For formatting integers in a #[no_std] context consider the numtoa crate.

For working with big numbers consider num-bigint and num-traits.

Impact

Affected versions

lexical (<= 6.1.1)

Security releases

lexical → 7.0.0 (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 lexical to 7.0.0 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-C2HM-MJXV-89R4? GHSA-C2HM-MJXV-89R4 is a low-severity security vulnerability in lexical (rust), affecting versions <= 6.1.1. It is fixed in 7.0.0.
Which versions of lexical are affected by GHSA-C2HM-MJXV-89R4? lexical (rust) versions <= 6.1.1 is affected.
Is there a fix for GHSA-C2HM-MJXV-89R4? Yes. GHSA-C2HM-MJXV-89R4 is fixed in 7.0.0. Upgrade to this version or later.
Is GHSA-C2HM-MJXV-89R4 exploitable, and should I be worried? Whether GHSA-C2HM-MJXV-89R4 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-C2HM-MJXV-89R4 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-C2HM-MJXV-89R4? Upgrade lexical to 7.0.0 or later.