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EUVD-2026-292590

fkie_cve-2026-35373

A logic error in the ln utility of uutils coreutils causes the program to reject source paths containing non-UTF-8 filename bytes when using target-directory forms (e.g., ln SOURCE... DIRECTORY). While GNU ln treats filenames as raw bytes and creates the links correctly, the uutils implementation enforces UTF-8 encoding, resulting in a failure to stat the file and a non-zero exit code. In environments where automated scripts or system tasks process valid but non-UTF-8 filenames common on Unix filesystems, this divergence causes the utility to fail, leading to a local denial of service for those specific operations.

GHSA-jcjr-rh8q-7xqf — ln: rejects non-UTF-8 source filenames in target-directory mode

Affected: crates.io: uu_ln

In target-directory forms (`ln SOURCE... DIRECTORY`), `ln` rejects source paths with non-UTF-8 filename bytes, while GNU accepts them. Breaks GNU compatibility for byte-oriented filenames on Unix filesystems.

PoC: ``` name=$(printf 'bad_\377'); mkdir dst; : > "$name"; ln "$name" dst # GNU: exit 0, creates dst/bad_\377 ; uutils: exit 1, dst empty ```

--- _Zellic private finding (zellic-ext/coreutils-private PR #84). Reported in the Zellic *uutils coreutils Program Security Assessment* (for Canonical, Jan 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`._

UBUNTU-CVE-2026-35373

Affected: Ubuntu:24.04:LTS: rust-coreutils, Ubuntu:25.10: rust-coreutils, Ubuntu:26.04:LTS: rust-coreutils