PatchTheCVECVE-2026-35346: The comm utility in uutils coreutils silently corrupts data by performing lossy UTF-8 conversion on all output
CVE-2026-35346 is a low-severity flaw (CVSS 3.3) affecting coreutils. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 3.3 (Low) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 93%) |
| CISA exploited list | No |
| Weakness | CWE-176 |
| Published | 2026-04-22 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-35346?
coreutils: upgrade to 0.6.0. Exact commands for each OS are on this page.
Is CVE-2026-35346 being exploited?
CVE-2026-35346 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-35346 affect?
CVE-2026-35346 affects coreutils. Severity is low (CVSS 3.3). 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 replacemen
How urgent is CVE-2026-35346?
Priority 18/100. Public exploit reference
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