CVE-2026-35346: Uutils Coreutils

Low severity, CVSS 3.3. EPSS: 0.2% chance of exploitation in the next 30 days.

The comm utility in uutils coreutils silently corrupts data by performing lossy UTF-8 conversion on all output lines. The implementation uses String::from_utf8_lossy(), which replaces invalid UTF-8 byte sequences with the Unicode replacement character (U+FFFD). This behavior differs from GNU comm, which processes raw bytes and preserves the original input. This results in corrupted output when the utility is used to compare binary files or files using non-UTF-8 legacy encodings.

Affected products

• Uutils Coreutils: before 0.6.0 (fixed in 0.6.0)

Published 2026-04-22. Last modified 2026-06-17.