CVE-2026-35346 Details
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.
A vulnerability exists in the comm utility of uutils coreutils, where it improperly handles non-UTF-8 binary data by applying a lossy UTF-8 conversion. This issue arises because the utility uses String::from_utf8_lossy(), which replaces invalid UTF-8 byte sequences with the Unicode replacement character. As a result, when comm is used to compare binary files or files with non-UTF-8 legacy encodings, the output data is silently corrupted. This behavior contrasts with GNU comm, which accurately processes raw bytes and maintains the integrity of the original input.
Users can update to uutils coreutils version 0.6.0 or later, where this issue has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/uutils/coreutils/issues/10192 | CISA-ADP | ExploitIssue TrackingVendor Advisory |
| https://github.com/uutils/coreutils/issues/10192 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/uutils/coreutils/pull/10206 | [email protected] | Issue TrackingPatch |
| https://github.com/uutils/coreutils/releases/tag/0.6.0 | [email protected] | Release Notes |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-176 | Improper Handling of Unicode Encoding | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| uutils coreutils | < 0.6.0 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 27, 2026 | Initial Analysis | [email protected] |
| Apr 22, 2026 | CVE Modified | CISA-ADP |
| Apr 22, 2026 | New CVE Received | [email protected] |