{"id":"CVE-2019-12290","details":"GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the inclusion of certain punycoded Unicode characters (that would be discarded when converted first to a Unicode label and then back to an ASCII label), arbitrary domains can be impersonated.","modified":"2026-06-18T04:04:43.092440350Z","published":"2019-10-22T16:15:10.877Z","related":["CGA-3386-58h9-9qmw","SUSE-SU-2019:3086-1","openSUSE-SU-2019:2611-1","openSUSE-SU-2019:2613-1","openSUSE-SU-2024:10950-1"],"database_specific":{},"references":[{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00008.html"},{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00009.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFT76Y7OSGPZV3EBEHD6ISVUM3DLARM/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KXDKYWFV6N2HHVSE67FFDM7G3FEL2ZNE/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ONG3GJRRJO35COPGVJXXSZLU4J5Y42AT/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RSI4TI2JTQWQ3YEUX5X36GTVGKO4QKZ5/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U6ZXL2RDNQRAHCMKWPOMJFKYJ344X4HL/"},{"type":"WEB","url":"https://usn.ubuntu.com/4168-1/"},{"type":"ADVISORY","url":"https://gitlab.com/libidn/libidn2/commit/614117ef6e4c60e1950d742e3edf0a0ef8d389de"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202003-63"},{"type":"FIX","url":"https://gitlab.com/libidn/libidn2/commit/241e8f486134793cb0f4a5b0e5817a97883401f5"},{"type":"FIX","url":"https://gitlab.com/libidn/libidn2/merge_requests/71"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.com/libidn/libidn2","events":[{"introduced":"0"},{"fixed":"3db6427d9ef42483405bfa75f234792ac073239e"},{"fixed":"241e8f486134793cb0f4a5b0e5817a97883401f5"},{"fixed":"614117ef6e4c60e1950d742e3edf0a0ef8d389de"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.2.0"}],"cpe":"cpe:2.3:a:gnu:libidn2:*:*:*:*:*:*:*:*","source":["CPE_RANGE","REFERENCES"]}}],"versions":["2.2.0","libidn2-2.1.1","libidn2-2.1.0","libidn2-2.0.5","libidn2-2.0.4","libidn2-2.0.3","libidn2-2.0.2","libidn2-2.0.1","libidn2-2.0.0","libidn2-0.16","libidn2-0.15","libidn2-0.14","libidn2-0.13","libidn2-0.12","libidn2-0.11","libidn2-0.10","libidn2-0.9","libidn2-0.8","libidn2-0.7","libidn2-0.6","libidn2-0.5","libidn2-0.4","libidn2-0.3"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-12290.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}