Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 5.7%
CVSS Severity
CVSS v3 Score 4.4
References
Products affected by CVE-2026-35347
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cpe:2.3:a:uutils:coreutils:-
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cpe:2.3:a:uutils:coreutils:0.0.1
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cpe:2.3:a:uutils:coreutils:0.0.1.1
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cpe:2.3:a:uutils:coreutils:0.0.12
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cpe:2.3:a:uutils:coreutils:0.0.13
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cpe:2.3:a:uutils:coreutils:0.0.14
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cpe:2.3:a:uutils:coreutils:0.0.15
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cpe:2.3:a:uutils:coreutils:0.0.16
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cpe:2.3:a:uutils:coreutils:0.0.17
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cpe:2.3:a:uutils:coreutils:0.0.18
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cpe:2.3:a:uutils:coreutils:0.0.19
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cpe:2.3:a:uutils:coreutils:0.0.2
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cpe:2.3:a:uutils:coreutils:0.0.20
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cpe:2.3:a:uutils:coreutils:0.0.21
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cpe:2.3:a:uutils:coreutils:0.0.22
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cpe:2.3:a:uutils:coreutils:0.0.23
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cpe:2.3:a:uutils:coreutils:0.0.24
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cpe:2.3:a:uutils:coreutils:0.0.25
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cpe:2.3:a:uutils:coreutils:0.0.26
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cpe:2.3:a:uutils:coreutils:0.0.27
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cpe:2.3:a:uutils:coreutils:0.0.28
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cpe:2.3:a:uutils:coreutils:0.0.29
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cpe:2.3:a:uutils:coreutils:0.0.3
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cpe:2.3:a:uutils:coreutils:0.0.30
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cpe:2.3:a:uutils:coreutils:0.0.4
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cpe:2.3:a:uutils:coreutils:0.0.5
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cpe:2.3:a:uutils:coreutils:0.0.6
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cpe:2.3:a:uutils:coreutils:0.0.7
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cpe:2.3:a:uutils:coreutils:0.0.8
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cpe:2.3:a:uutils:coreutils:0.0.9
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cpe:2.3:a:uutils:coreutils:0.1.0
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cpe:2.3:a:uutils:coreutils:0.2.0
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cpe:2.3:a:uutils:coreutils:0.2.2
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cpe:2.3:a:uutils:coreutils:0.3.0
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cpe:2.3:a:uutils:coreutils:0.4.0
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cpe:2.3:a:uutils:coreutils:0.5.0