{"id":"UBUNTU-CVE-2026-6390","details":"A flaw was found in GNU nano's multi-buffer error message handling. When a user opens multiple files at startup and one triggers an ALERT-level error, a specially crafted filename containing printf format specifiers can be reinterpreted. This format string vulnerability may allow an attacker to achieve stack information disclosure, cause a denial of service (crash), or potentially perform arbitrary memory writes.","modified":"2026-09-21T21:39:48.364660437Z","published":"2026-07-23T05:16:00Z","upstream":["CVE-2026-6390"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-6390"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-6390"}],"affected":[{"package":{"name":"nano","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/nano?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.2-1ubuntu0.2"}]}],"versions":["5.6.1-1build1","5.9-1","6.0-1","6.1-1","6.2-1","6.2-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"nano","binary_version":"6.2-1ubuntu0.2"},{"binary_name":"nano-tiny","binary_version":"6.2-1ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6390.json"}},{"package":{"name":"nano","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/nano?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2-2ubuntu0.2"}]}],"versions":["7.2-1","7.2-2","7.2-2build1","7.2-2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"nano","binary_version":"7.2-2ubuntu0.2"},{"binary_name":"nano-tiny","binary_version":"7.2-2ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6390.json"}},{"package":{"name":"nano","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/nano?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4-1ubuntu0.1"}]}],"versions":["8.3-1","8.4-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"nano","binary_version":"8.4-1ubuntu0.1"},{"binary_name":"nano-tiny","binary_version":"8.4-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6390.json"}},{"package":{"name":"nano","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/nano?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.7.1-1ubuntu0.1"}]}],"versions":["8.4-1","8.6-1","8.7-1","8.7.1-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"8.7.1-1ubuntu0.1","binary_name":"nano"},{"binary_name":"nano-tiny","binary_version":"8.7.1-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6390.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}