{"schemaVersion":3,"id":"CVE-2026-6390","aliases":["UBUNTU-CVE-2026-6390","DEBIAN-CVE-2026-6390"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-07-23T03:55:42.246Z","modified":"2026-09-01T12:37:33.933Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.8,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H","exploitability":3.3,"impact":9.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H","exploitability":3.3,"impact":9.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00154,"percentile":0.04143,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00154},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00154,"percentile":0.04143}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00154,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00154,"percentile":0.04143}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-134","name":"Use of Externally-Controlled Format String","description":"The product uses a function that accepts a format string as an argument, but the format string originates from an external source.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/134.html"}],"affected":[{"vendor":"debian","product":"nano","name":"nano","label":"nano","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/nano","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 9.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 9.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"nano","name":"nano","label":"nano","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/nano","purlType":"deb","versions":[{"text":"< 6.2-1ubuntu0.2","noFixRecorded":false,"fixedIn":null},{"text":"< 7.2-2ubuntu0.2","noFixRecorded":false,"fixedIn":null},{"text":"< 8.4-1ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 8.7.1-1ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 6.2-1ubuntu0.2 | < 7.2-2ubuntu0.2 | < 8.4-1ubuntu0.1 | < 8.7.1-1ubuntu0.1","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-6390","label":"access.redhat.com/security/cve/CVE-2026-6390","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458767","label":"bugzilla.redhat.com/show_bug.cgi?id=2458767","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]},{"url":"https://ubuntu.com/security/CVE-2026-6390","label":"ubuntu.com/security/CVE-2026-6390","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6390","label":"www.cve.org/CVERecord?id=CVE-2026-6390","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-6390","label":"security-tracker.debian.org/tracker/CVE-2026-6390","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-07-23T03:55:42.246Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-01T12:37:33.933Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":27,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T01:34:29.366Z","stale":false,"partial":false}}