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Vulnerability · Published Apr 22, 2026 · Assigned by canonical

CVE-2026-35347uutils coreutils comm Silent Data Loss or Denial of Service via Improper Input Validation

Medium 4.4

In plain English

A medium-severity improper input validation in coreutils from Uutils. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.1%top 97.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rust-coreutilsno fix listedDEBIAN-CVE-2026-35347
Debian:13rust-coreutilsno fix listedDEBIAN-CVE-2026-35347
Debian:14rust-coreutils0.6.0-1DEBIAN-CVE-2026-35347
Ubuntu:24.04:LTSrust-coreutilsno fix listedUBUNTU-CVE-2026-35347
Ubuntu:25.10rust-coreutilsno fix listedUBUNTU-CVE-2026-35347

Affected products (as reported)

VendorProductVersions
Uutils coreutils 0 – before 0.6.0

Weakness: CWE-20 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References