Improper input validation in Uutils Coreutils
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.001 (3.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Uutils Coreutils — versions 0
Weakness classification (CWE)
References
- github.com/uutils/coreutils/pull/9545 (issue-tracking, Patch, patch, Issue Tracking)
- github.com/uutils/coreutils/releases/tag/0.6.0 (vendor-advisory, Release Notes)
Frequently asked questions
- What is CVE-2026-35347?
- CVE-2026-35347 is a medium-severity vulnerability in Uutils Coreutils, classified under Improper Input Validation. CVSS score: 4.4/10. Published 2026-04-22.
- How severe is CVE-2026-35347?
- Medium severity. CVSS v3 base score is 4.4 out of 10.