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    CVE-2026-35346

    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.

    Published:Apr 22, 2026
    Last Modified:Apr 27, 2026
    EPS:Apr 22, 2026
    EPSS Score:0.00011
    CVSS Score:3.3

    Affected Products

    Vendor
    Uutils
    Product
    Coreutils

    Exploits

    https://github.com/uutils/coreutils/issues/10192https://github.com/uutils/coreutils/issues/10192

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic

    Related CVEs

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    CVE-2026-35376 (CVSS 4.5) — A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the chcon utility of uutils coreutils during r…
    CVE-2026-35375 (CVSS 3.3) — A logic error in the split utility of uutils coreutils causes the corruption of output filenames when provided…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High