{"schemaVersion":3,"id":"CVE-2026-56391","aliases":["MGASA-2026-0439","RHSA-2026:46515","UBUNTU-CVE-2026-56391","DEBIAN-CVE-2026-56391"],"status":"published","duplicateOf":null,"title":null,"description":"GNU coreutils uniq is vulnerable to an out‑of‑bounds read due to incorrect handling of multibyte input when the -w (--check-chars) option is used. The find_field() function miscalculates the byte length of characters by repeatedly processing a fixed pointer instead of advancing through the input, resulting in an inflated length value.\nThis incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input.\n\nWhen running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure.\n\n\nThis issue has been fixed in the commit 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