Loading...
Skip to main content
GeekWala

CVE-2020-35865 — Vulnerability in os_str_bytes — CVE Details

HIGH

os_str_bytes relies on undefined behavior of `char::from_u32_unchecked`

Published August 25, 2021Updated November 8, 2023Source: osv

Summary

The Windows implementation of this crate relied on the behavior of std::char::from_u32_unchecked when its safety clause is violated. Even though this worked with Rust versions up to 1.42 (at least), that behavior could change with any new Rust version, possibly leading a security issue. The flaw was corrected in version 2.0.0.

Advisory Timeline

  • First published August 25, 2021 (1874 days ago).
  • Last revised November 8, 2023 — 804 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update os_str_bytes to 2.0.0 or later
cargo update -p os_str_bytes --precise 2.0.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
os_str_bytes
crates.io
All versions2.0.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Frequently Asked Questions

What is CVE-2020-35865?
os_str_bytes relies on undefined behavior of `char::from_u32_unchecked` This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2020-35865?
CVE-2020-35865 affects os_str_bytes. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2020-35865 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-q948-x8rf-888m
RUSTSEC-2020-0012

Related CVEs

  • CVE-2026-93657
    HIGH

    hickory-resolver: Resolver::lookup() and Resolver::lookup_ip() APIs obscure DNSSEC validation failures

  • CVE-2026-18140
    HIGH

    aws-smithy-json: Uncontrolled recursion in the aws-smithy-json unknown-key skip path allows unauthenticated remote denial of service in smithy-rs generated servers

More crates.io advisories

Check if you're affected

Scan your dependencies to see if this vulnerability affects your projects.

Scan Your Dependencies