{"id":"DEBIAN-CVE-2026-56391","details":"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.  This incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input.  When running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure.   This issue has been fixed in the commit d64e35a8a4c0e4608321433e0d84d917e4e36371.","modified":"2026-09-01T16:06:51.725539527Z","published":"2026-07-24T09:16:25.003Z","upstream":["CVE-2026-56391"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-56391"}],"affected":[{"package":{"name":"coreutils","ecosystem":"Debian:12","purl":"pkg:deb/debian/coreutils?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.1-1","9.10-1","9.4-1","9.4-2","9.4-3","9.4-3.1","9.5-1","9.6-1","9.6-2","9.7-1","9.7-2","9.7-3"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56391.json"}},{"package":{"name":"coreutils","ecosystem":"Debian:13","purl":"pkg:deb/debian/coreutils?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.10-1","9.7-3"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56391.json"}},{"package":{"name":"coreutils","ecosystem":"Debian:14","purl":"pkg:deb/debian/coreutils?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.10-1","9.7-3"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56391.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"}]}