GHSA-jcjr-rh8q-7xqf: ln: rejects non-UTF-8 source filenames in target-directory mode
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._
Details
Original advisory: https://github.com/advisories/GHSA-jcjr-rh8q-7xqf
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-353730.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-35373 | coverage & exploitation status | NVD · CVE.org |
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