Uutils coreutils up to 0.5.x Mkdir Utility toctou

Summaryinfo

A vulnerability has been found in Uutils coreutils up to 0.5.x and classified as problematic. Affected by this issue is some unknown functionality of the component Mkdir Utility. Performing a manipulation results in toctou. This vulnerability is cataloged as CVE-2026-35353. The attack must be initiated from a local position. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Uutils coreutils up to 0.5.x. This affects an unknown part of the component Mkdir Utility. The manipulation with an unknown input leads to a toctou vulnerability. CWE is classifying the issue as CWE-367. 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. This can cause the product to perform invalid actions when the resource is in an unexpected state. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The weakness was shared by Zellic. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-35353 since 04/02/2026. The exploitability is told to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.6.0 eliminates this vulnerability.

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Productinfo

Vendor

• Uutils

Name

• coreutils

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5

Website

• Product: https://github.com/uutils/coreutils/

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