GHSA-66p5-j55p-32r9: Smallvec Smallvec Creates Uninitialized Value Of Vulnerability

MODERATE
Share
CWE-457
Published
Advisory Summary

GHSA-66p5-j55p-32r9 is a MODERATE smallvec creates uninitialized value of vulnerability (CWE-457: Use of Uninitialized Variable) affecting Smallvec libraries in the crates.io ecosystem. The issue involves smallvec creates uninitialized value of any type. Remediation is available by upgrading affected packages to version 0.6.13.

GHSA-66p5-j55p-32r9 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-66p5-j55p-32r9
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-457: Use of Uninitialized Variable
Affected Product Smallvec
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-66p5-j55p-32r9

To remediate this vulnerability, upgrade all affected Smallvec dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

smallvec fixed: 0.6.13 
Upgrade smallvec to 0.6.13
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for smallvec

How to Check if You Are Affected

To determine whether your application is affected by GHSA-66p5-j55p-32r9, inspect your project dependencies for Smallvec:

inspect dependencies for smallvec

Analyze the terminal output to locate any version of Smallvec in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.13), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-457: Use of Uninitialized Variable, where the code uses a variable that has not been initialized, leading to unpredictable or unintended results. In Smallvec, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Affected versions of this crate called `mem::uninitialized()` to create values of a user-supplied type `T`. This is unsound e.g. if `T` is a reference type (which must be non-null and thus may not remain uninitialized). The flaw was corrected by avoiding the use of `mem::uninitialized()`, using `MaybeUninit` instead.

GHSA-66p5-j55p-32r9 Affected Smallvec Versions

1 component(s)
Fixed Versions:
0.6.13
Product / Package Ecosystem Affected Versions Fixed Version
smallvec
 crates.io
< 0.6.13
0.6.13

References

Smallvec Source Repository REPOSITORY
https://github.com/servo/rust-smallvec/issues/126
Smallvec Source Repository REPOSITORY
https://github.com/servo/rust-smallvec/pull/162
Smallvec Source Repository REPOSITORY
https://github.com/servo/rust-smallvec
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2018-0018.html

Frequently Asked Questions

What is GHSA-66p5-j55p-32r9?
GHSA-66p5-j55p-32r9 is a security vulnerability in Smallvec involving smallvec creates uninitialized value of any type under CWE-457: Use of Uninitialized Variable.
Which Smallvec versions are affected?
Affected versions include releases prior to 0.6.13 across affected packages: smallvec.
What version fixes GHSA-66p5-j55p-32r9?
Upgrading to 0.6.13 (or the latest patched release for your respective branch) resolves the vulnerability.
Is smallvec affected?
Yes, smallvec is affected in releases prior to 0.6.13. Upgrade your dependency to 0.6.13 or later.
What CWE is associated with GHSA-66p5-j55p-32r9?
GHSA-66p5-j55p-32r9 is classified under CWE-457: Use of Uninitialized Variable (The code uses a variable that has not been initialized, leading to unpredictable or unintended results.).
How can I check crates.io dependencies for GHSA-66p5-j55p-32r9?
Run the dependency tree command: 'inspect dependencies for smallvec'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-66p5-j55p-32r9",
  "modified" : "2021-08-06T16:36:54Z",
  "published" : "2021-08-25T21:00:25Z",
  "aliases" : [ ],
  "summary" : "smallvec creates uninitialized value of any type",
  "details" : "Affected versions of this crate called `mem::uninitialized()` to create values of a user-supplied type `T`.\nThis is unsound e.g. if `T` is a reference type (which must be non-null and thus may not remain uninitialized).\n \nThe flaw was corrected by avoiding the use of `mem::uninitialized()`, using `MaybeUninit` instead.\n",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "smallvec"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.13"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/servo/rust-smallvec/issues/126"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/servo/rust-smallvec/pull/162"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/servo/rust-smallvec"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2018-0018.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-457" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-06T16:36:54Z",
    "nvd_published_at" : null
  }
}