Uutils coreutils up to 0.5.x Comm Utility /dev/zero are_files_identical input validation

Summaryinfo

A vulnerability was found in Uutils coreutils up to 0.5.x. It has been declared as problematic. Affected by this issue is the function are_files_identical of the file /dev/zero of the component Comm Utility. Executing a manipulation can lead to input validation. This vulnerability appears as CVE-2026-35347. The attack requires local access. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Uutils coreutils up to 0.5.x. It has been declared as problematic. This vulnerability affects the function are_files_identical of the file /dev/zero of the component Comm Utility. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity, and availability. CVE summarizes:

The comm utility in uutils coreutils incorrectly consumes data from non-regular file inputs before performing comparison operations. The are_files_identical function opens and reads from both input paths to compare content without first verifying if the paths refer to regular files. If an input path is a FIFO or a pipe, this pre-read operation drains the stream, leading to silent data loss before the actual comparison logic is executed. Additionally, the utility may hang indefinitely if it attempts to pre-read from infinite streams like /dev/zero.

The weakness was presented by Zellic. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-35347 since 04/02/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is 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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