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uutils coreutils comm Silent Data Corruption via Lossy UTF-8 Normalization

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-35346
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 07:55 UTC · Revision 1

Source evidence

uutils coreutils comm Silent Data Corruption via Lossy UTF-8 Normalization

core-osv · Original source

Published 22 Apr 2026, 16:07 UTC

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.

osv:CVE-2026-35346
Complete source record
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  "url": "https://osv.dev/vulnerability/CVE-2026-35346",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "uutils coreutils comm Silent Data Corruption via Lossy UTF-8 Normalization",
    "summary": "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.",
    "evidence": "osv:CVE-2026-35346",
    "products": [],
    "severity": "low",
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      "modified": "2026-10-28T02:30:33.796336131Z",
      "provider": "osv",
      "references": [
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        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35346.json",
        "https://github.com/uutils/coreutils/releases/tag/0.6.0",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35346",
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      "provider_metadata": {
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35346.json"
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    "related_cves": [
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        "value": "CVE-2026-35346",
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
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  "published_at": "2026-04-22T16:07:51.755+00:00"
}