GHSA-x8jh-xj3x-gx3c — fast-float
GHSA-x8jh-xj3x-gx3c is a security vulnerability in fast-float. No vendor fix is recorded yet; mitigation options are listed below.
`fast-float` has multiple soundness issues
Real-World Exposure
fast-floatReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
Description
fast-float contains multiple soundness issues:
- Undefined behavior when checking input length, which has been merged but no package pubished.
- Many functions marked as safe with non-local safety guarantees
The library is also unmaintained.
Alternatives
For quickly parsing floating-point numbers third-party crates are generally no longer needed. A fast float parsing algorithm by the author of lexical has been merged into libcore. When requiring direct parsing from bytes and/or partial parsers, the fast-float2 fork of fast-float containing these security patches and reduces overall usage of unsafe.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | fast-float | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for fast-float, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of fast-float has shipped for GHSA-x8jh-xj3x-gx3c yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-x8jh-xj3x-gx3c can be triaged on real exposure rather than presence alone.
Tailored to GHSA-x8jh-xj3x-gx3c. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-x8jh-xj3x-gx3c in your dependencies?
O3 Security finds GHSA-x8jh-xj3x-gx3c across crates.io dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.