---
id: CVE-2026-35353
aliases:
  - GHSA-mj6p-44ch-cq69
title: 'mkdir: -m exposes directory with umask perms before chmod (race window)'
summary: 'mkdir: -m exposes directory with umask perms before chmod (race window)'
severity: low
cvss: 3.3
cwe:
  - CWE-362
  - CWE-367
  - CWE-732
vendor: uu_mkdir
product: uu_mkdir
ecosystem: rust
affected:
  - uu_mkdir < 0.6.0
patched:
  - uu_mkdir 0.6.0
published: '2026-07-06'
updated: '2026-07-06'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-mj6p-44ch-cq69'
references:
  - url: >-
      https://github.com/uutils/coreutils/security/advisories/GHSA-mj6p-44ch-cq69
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-35353'
  - url: 'https://github.com/uutils/coreutils/pull/10036'
  - url: >-
      https://github.com/uutils/coreutils/commit/037b9583bc03d814e8516df54ebcda6f681fe1f8
  - url: 'https://github.com/uutils/coreutils/releases/tag/0.6.0'
  - url: 'https://github.com/advisories/GHSA-mj6p-44ch-cq69'
tags:
  - ghsa
  - rust
epss: 0.00119
epssPercentile: 0.01569
ingestedAt: '2026-07-06T20:46:12.677Z'
---

## Overview

The mkdir utility in uutils coreutils incorrectly applies permissions when using the -m flag by creating a directory with umask-derived permissions (typically 0755) before subsequently changing them to the requested mode via a separate chmod system call. In multi-user environments, this introduces a brief window where a directory intended to be private is accessible to other users, potentially leading to unauthorized data access.

---
_Zellic finding 3.48. Reported in the Zellic *uutils coreutils Program Security Assessment* (for Canonical, Jan 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`._

## Affected packages

- `uu_mkdir < 0.6.0`

## Remediation

Upgrade to a patched release:

- `uu_mkdir 0.6.0`