CVE-2026-35347

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.

Score
CVSS 3.1 4.4 Medium
Status
Analyzed - security@ubuntu.com
Published
2026-04-22
Last modified
2026-10-26
Weaknesses
CWE-20

Affected products

References

 
 
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