{"id":"CVE-2026-35347","aliases":["GHSA-3wfc-mgpm-9rq6"],"url":"https://o3.security/vulnerability/CVE-2026-35347","summary":"uutils coreutils comm Silent Data Loss or Denial of Service via Improper Input Validation","details":"The comm utility in uutils coreutils incorrectly consumes data from non-regular file inputs before performing comparison operations. The are_files_identical function opens and reads from both input paths to compare content without first verifying if the paths refer to regular files. If an input path is a FIFO or a pipe, this pre-read operation drains the stream, leading to silent data loss before the actual comparison logic is executed. Additionally, the utility may hang indefinitely if it attempts to pre-read from infinite streams like /dev/zero.\n\n---\n_Zellic finding 3.35. Reported in the Zellic *uutils coreutils Program Security Assessment* (for Canonical, Jan 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`._","published":"2026-04-22T16:07:54.366Z","modified":"2026-08-12T03:51:15.869948514Z","cvss":{"score":4.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"},"epss":{"score":0.00135,"percentile":0.03315,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"uu_comm","fixedVersion":"0.6.0"}],"fix":{"url":"https://github.com/uutils/coreutils/pull/9545","label":"uutils/coreutils#9545"},"references":[{"type":"WEB","url":"https://github.com/uutils"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35347.json"},{"type":"ADVISORY","url":"https://github.com/uutils/coreutils/releases/tag/0.6.0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35347"},{"type":"FIX","url":"https://github.com/uutils/coreutils/pull/9545"},{"type":"PACKAGE","url":"https://github.com/uutils/coreutils"},{"type":"WEB","url":"https://github.com/uutils/coreutils/security/advisories/GHSA-3wfc-mgpm-9rq6"},{"type":"WEB","url":"https://github.com/uutils/coreutils/commit/75f45e87e52ed95840494963ab9a28651165d56e"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:15.869948514Z"}}