GHSA-c2hm-mjxv-89r4: Multiple soundness issues in lexical

1. GitHub Advisory Database
2. GitHub Reviewed
3. GHSA-c2hm-mjxv-89r4

Multiple soundness issues in lexical

Moderate severity GitHub Reviewed Published Sep 4, 2023 to the GitHub Advisory Database

Vulnerability details Dependabot alerts 0

Package

cargo lexical (Rust)

Affected versions

<= 6.1.1

Patched versions

None

Description

lexical contains multiple soundness issues:

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

The crate also has some correctness issues and appears to be unmaintained.

Alternatives

For quickly parsing floating-point numbers third-party crates are no longer needed. A fast float parsing algorith 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.

References

• https://github.com/Alexhuszagh/rust-lexical
• https://rustsec.org/advisories/RUSTSEC-2023-0055.html

Published to the GitHub Advisory Database

Sep 4, 2023

Reviewed

Sep 4, 2023

Severity

Moderate

Weaknesses

No CWEs

CVE ID

No known CVE

GHSA ID

GHSA-c2hm-mjxv-89r4

Source code

Alexhuszagh/rust-lexical

Checking history

See something to contribute? Suggest improvements for this vulnerability.