CVE-2026-35357: Coreutils Uutils Coreutils Has A Time-of-check Vulnerability

MODERATE
Advisory Identifier: GHSA-2m8x-mvfx-gwgj
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CVSS 4.7
CWE-367
Published
Advisory Summary

CVE-2026-35357 is a MODERATE (CVSS 4.7) uutils coreutils has a time-of-check vulnerability (CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition) affecting Coreutils libraries in the crates.io ecosystem. The issue involves uutils coreutils has a time-of-check time-of-use (toctou) race condition. Remediation is available in the latest vendor maintenance releases.

CVE-2026-35357 at a Glance

CVE Identifier CVE-2026-35357
GHSA Identifier GHSA-2m8x-mvfx-gwgj
Severity MODERATE
CVSS v3.1 Base Score 4.7
CWE Classification CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Product Coreutils
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 4.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-35357

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

coreutils fixed: Latest secure release 
Upgrade coreutils to Latest secure release
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 coreutils

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-35357, inspect your project dependencies for Coreutils:

inspect dependencies for coreutils

Analyze the terminal output to locate any version of Coreutils in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-367: Time-of-check Time-of-use (TOCTOU) Race Condition, where the product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. In Coreutils, 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

The cp utility in uutils coreutils is vulnerable to an information disclosure race condition. Destination files are initially created with umask-derived permissions (e.g., 0644) before being restricted to their final mode (e.g., 0600) later in the process. A local attacker can race to open the file during this window; once obtained, the file descriptor remains valid and readable even after the permissions are tightened, exposing sensitive or private file contents.

CVE-2026-35357 Affected Coreutils Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
coreutils
 crates.io
≤ 0.8.0

References

NVD — CVE-2026-35357 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35357
Coreutils Source Repository REPOSITORY
https://github.com/uutils/coreutils/issues/10011
Coreutils Source Repository REPOSITORY
https://github.com/uutils/coreutils

Frequently Asked Questions

What is CVE-2026-35357?
CVE-2026-35357 is a security vulnerability in Coreutils involving uutils coreutils has a Time-of-check Time-of-use (TOCTOU) Race Condition under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition.
Which Coreutils versions are affected?
Affected versions include releases prior to current release patches across affected packages: coreutils.
What version fixes CVE-2026-35357?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is coreutils affected?
Yes, coreutils is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-35357?
CVE-2026-35357 has a CVSS v3.1 base score of 4.7 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-35357?
CVE-2026-35357 is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition (The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.).
How can I check crates.io dependencies for CVE-2026-35357?
Run the dependency tree command: 'inspect dependencies for coreutils'. 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-2m8x-mvfx-gwgj",
  "modified" : "2026-04-30T17:12:12Z",
  "published" : "2026-04-22T18:31:45Z",
  "aliases" : [ "CVE-2026-35357" ],
  "summary" : "uutils coreutils has a Time-of-check Time-of-use (TOCTOU) Race Condition",
  "details" : "The cp utility in uutils coreutils is vulnerable to an information disclosure race condition. Destination files are initially created with umask-derived permissions (e.g., 0644) before being restricted to their final mode (e.g., 0600) later in the process. A local attacker can race to open the file during this window; once obtained, the file descriptor remains valid and readable even after the permissions are tightened, exposing sensitive or private file contents.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "coreutils"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.8.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35357"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/issues/10011"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/uutils/coreutils"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-367" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-30T17:12:12Z",
    "nvd_published_at" : "2026-04-22T17:16:38Z"
  }
}