GitHub Advisoryadvisory · crates.io
GHSA-6gcw-w7cp-94g9 comm: lossy UTF-8 conversion silently corrupts non-UTF-8 output
LOW
Official page ↗
- Aliases
- CVE-2026-35346
- Ecosystem
- crates.io
- Packages
- uu_comm
- Severity
- Low
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- CWE-116, CWE-176
- Reviewed
- 2026-07-06
Affected packages
• crates.io uu_comm: < 0.6.0 → fixed in 0.6.0
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.
---
_Zellic finding 3.34. Reported in the Zellic *uutils coreutils Program Security Assessment* (for Canonical, Jan 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`._
Related
Alias · CVE (1)
- CVE-2026-35346 The comm utility in uutils coreutils silently corrupts data by performing lossy UTF-8 conversion on all output lines. vulnerability
References
- https://github.com/uutils/coreutils/security/advisories/GHSA-6gcw-w7cp-94g9 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-35346 advisory
- https://github.com/uutils/coreutils/issues/10192 web
- https://github.com/uutils/coreutils/pull/10206 web
- https://github.com/uutils/coreutils/commit/b9372e509ea9b278fe13763237067a261bb8c946 web
- https://github.com/uutils/coreutils package
- https://github.com/uutils/coreutils/releases/tag/0.6.0 web