{"id":"CVE-2026-35341","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-35341","summary":"mkfifo: permissions of an existing file are changed after FIFO creation fails","details":"When `mkfifo()` fails (e.g. target already exists), the code shows an error but is missing a `continue;`, so it falls through to `fs::set_permissions` and changes the permissions of the pre-existing file to the default FIFO mode (`0o666` & umask -> `0644`).\n\n```\n$ touch secret; chmod 000 secret\n$ coreutils mkfifo secret fifo3 fifo4\nmkfifo: cannot create fifo 'secret': File exists\n$ ll secret      # uutils:\nprw-r--r-- secret   # changed to 644 (GNU leaves it 000)\n```\n\n**Impact:** an attacker (or user error) can relax permissions on sensitive owner-only files such as SSH private keys, exposing them to other users. Recommendation: add `continue;` after the error.\n\n**Remediation:** Acknowledged by Canonical; fixed in PR #10376.\n\n---\n_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.8. Credit: Zellic._\n\n_Upstream tracking issue: https://github.com/uutils/coreutils/issues/10020 · CVE-2026-35341_","published":"2026-07-06T21:53:34Z","modified":"2026-07-06T22:11:26.860551Z","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},"epss":{"score":0.00165,"percentile":0.06141,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"uu_mkfifo","fixedVersion":"0.6.0"}],"fix":{"url":"https://github.com/uutils/coreutils/pull/10376","label":"uutils/coreutils#10376"},"references":[{"type":"WEB","url":"https://github.com/uutils/coreutils/security/advisories/GHSA-pmf6-rcx4-v53v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35341"},{"type":"WEB","url":"https://github.com/uutils/coreutils/issues/10020"},{"type":"WEB","url":"https://github.com/uutils/coreutils/pull/10376"},{"type":"PACKAGE","url":"https://github.com/uutils/coreutils"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-06T22:11:26.860551Z"}}