{"id":"GHSA-3wfc-mgpm-9rq6","summary":"comm: FIFO/pipe inputs are drained before comparison (data loss / hang)","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`._","aliases":["CVE-2026-35347"],"modified":"2026-07-06T20:41:08.211382Z","published":"2026-07-06T20:17:59Z","database_specific":{"cwe_ids":["CWE-20"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-07-06T20:17:59Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/uutils/coreutils/security/advisories/GHSA-3wfc-mgpm-9rq6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35347"},{"type":"WEB","url":"https://github.com/uutils/coreutils/pull/9545"},{"type":"WEB","url":"https://github.com/uutils/coreutils/commit/75f45e87e52ed95840494963ab9a28651165d56e"},{"type":"PACKAGE","url":"https://github.com/uutils/coreutils"},{"type":"WEB","url":"https://github.com/uutils/coreutils/releases/tag/0.6.0"}],"affected":[{"package":{"name":"uu_comm","ecosystem":"crates.io","purl":"pkg:cargo/uu_comm"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.6.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-3wfc-mgpm-9rq6/GHSA-3wfc-mgpm-9rq6.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"}]}