# CVE-2026-35347

> Vulnerability · severity: **MEDIUM** (CVSS 4.4).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-35347
- **Published:** 2026-04-22
- **CVSS severity:** MEDIUM
- **CVSS base score:** 4.4
- **CWE codes:** CWE-20

## Affected products

- `uutils:coreutils`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-35347

## Citation

> AI Analytics. CVE-2026-35347. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-35347. Derived from NIST NVD. Licensed CC0.

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