CVE-2026-35347: Uutils Coreutils

Medium severity, CVSS 4.4. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Uutils Coreutils: before 0.6.0 (fixed in 0.6.0)

Published 2026-04-22. Last modified 2026-06-17.