CVE-2026-35346
uutils coreutils comm Silent Data Corruption via Lossy UTF-8 Normalization
- State
- Published
- Severity
- 3.3 Low
- Published
- Apr 22, 2026
- Updated
- Apr 22, 2026
- Reserved
- Apr 2, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.3 Low | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | canonical |
Weaknesses
- CWE-176 Improper Handling of Unicode Encoding
Affected Products
| Product | Versions |
|---|---|
coreutilsUutils |
|
References
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