CVE-2026-35376: Coreutils Uutils Coreutils Has A Time-of-check Vulnerability

MODERATE
Advisory Identifier: GHSA-6g8r-74qp-6859
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CVSS 4.5
CWE-367
Published
Advisory Summary

CVE-2026-35376 is a MODERATE (CVSS 4.5) 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-2026-35376 at a Glance

CVE Identifier CVE-2026-35376
GHSA Identifier GHSA-6g8r-74qp-6859
Severity MODERATE
CVSS v3.1 Base Score 4.5
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: 4.5

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:L/I:L/A:L).

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 Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-35376

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-2026-35376, 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

A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the chcon utility of uutils coreutils during recursive operations. The implementation resolves recursive targets using a fresh path lookup (via fts_accpath) rather than binding the traversal and label application to the specific directory state encountered during traversal. Because these operations are not anchored to file descriptors, a local attacker with write access to a directory tree can exploit timing-sensitive rename or symbolic link races to redirect a privileged recursive relabeling operation to unintended files or directories. This vulnerability breaks the hardening expectations for SELinux administration workflows and can lead to the unauthorized modification of security labels on sensitive system objects.

CVE-2026-35376 Affected Coreutils Versions

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

References

NVD — CVE-2026-35376 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35376
Coreutils Source Repository REPOSITORY
https://github.com/uutils/coreutils/pull/11402
Coreutils Source Repository REPOSITORY
https://github.com/uutils/coreutils
Coreutils Release RELEASE
https://github.com/uutils/coreutils/releases/tag/0.8.0

Frequently Asked Questions

What is CVE-2026-35376?
CVE-2026-35376 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-2026-35376?
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-2026-35376?
CVE-2026-35376 has a CVSS v3.1 base score of 4.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-35376?
CVE-2026-35376 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-2026-35376?
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-6g8r-74qp-6859",
  "modified" : "2026-04-30T17:59:49Z",
  "published" : "2026-04-22T18:31:46Z",
  "aliases" : [ "CVE-2026-35376" ],
  "summary" : "uutils coreutils has a Time-of-check Time-of-use (TOCTOU) Race Condition",
  "details" : "A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the chcon utility of uutils coreutils during recursive operations. The implementation resolves recursive targets using a fresh path lookup (via fts_accpath) rather than binding the traversal and label application to the specific directory state encountered during traversal. Because these operations are not anchored to file descriptors, a local attacker with write access to a directory tree can exploit timing-sensitive rename or symbolic link races to redirect a privileged recursive relabeling operation to unintended files or directories. This vulnerability breaks the hardening expectations for SELinux administration workflows and can lead to the unauthorized modification of security labels on sensitive system objects.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "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-2026-35376"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/pull/11402"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/uutils/coreutils"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/releases/tag/0.8.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-367" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-30T17:59:49Z",
    "nvd_published_at" : "2026-04-22T17:16:42Z"
  }
}