CVE-2026-35346
uutils coreutils comm Silent Data Corruption via Lossy UTF-8 Normalization
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.
INFO
Published Date :
April 22, 2026, 5:16 p.m.
Last Modified :
April 27, 2026, 12:28 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | cc1ad9ee-3454-478d-9317-d3e869d708bc | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Update uutils coreutils to the latest version.
- Verify comm utility handles non-UTF-8 data correctly.
- Avoid using comm for binary file comparison.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-35346.
| URL | Resource |
|---|---|
| https://github.com/uutils/coreutils/issues/10192 | Exploit Issue Tracking Vendor Advisory |
| https://github.com/uutils/coreutils/pull/10206 | Issue Tracking Patch |
| https://github.com/uutils/coreutils/releases/tag/0.6.0 | Release Notes |
| https://github.com/uutils/coreutils/issues/10192 | Exploit Issue Tracking Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-35346 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-35346
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-35346 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-35346 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:uutils:coreutils:*:*:*:*:*:rust:*:* versions up to (excluding) 0.6.0 Added Reference Type Canonical Ltd.: https://github.com/uutils/coreutils/issues/10192 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type Canonical Ltd.: https://github.com/uutils/coreutils/pull/10206 Types: Issue Tracking, Patch Added Reference Type Canonical Ltd.: https://github.com/uutils/coreutils/releases/tag/0.6.0 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/uutils/coreutils/issues/10192 Types: Exploit, Issue Tracking, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 22, 2026
Action Type Old Value New Value Added Reference https://github.com/uutils/coreutils/issues/10192 -
New CVE Received by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Added CWE CWE-176 Added Reference https://github.com/uutils/coreutils/issues/10192 Added Reference https://github.com/uutils/coreutils/pull/10206 Added Reference https://github.com/uutils/coreutils/releases/tag/0.6.0