{"schemaVersion":3,"id":"CVE-2026-56001","aliases":["UBUNTU-CVE-2026-56001","DEBIAN-CVE-2026-56001"],"status":"published","duplicateOf":null,"title":null,"description":"A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont","dates":{"published":"2026-07-08T08:49:24.706Z","modified":"2026-07-09T03:55:45.984Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":7.2,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":7.2,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00392,"percentile":0.31825,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00392},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00392,"percentile":0.31825}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00616,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00392,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00392,"percentile":0.31825}]},"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-122","name":"Heap-based Buffer Overflow","description":"A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/122.html"}],"affected":[{"vendor":"debian","product":"libxfont","name":"libxfont","label":"libxfont","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libxfont","purlType":"deb","versions":[{"text":"< 1:2.0.6-1+deb12u1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.6-1+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.8-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:2.0.6-1+deb12u1 | < 1:2.0.6-1+deb13u1 | < 1:2.0.8-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libxfont","name":"libxfont","label":"libxfont","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libxfont","purlType":"deb","versions":[{"text":"< 1:1.4.7-1ubuntu0.4+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:1.5.1-1ubuntu0.16.04.4+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.3-1ubuntu0.1~esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.3-1ubuntu0.20.04.1~esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.5-1ubuntu0.2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.6-1+deb13u1build0.24.04.2","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 1:2.0.6-2ubuntu0.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:1.4.7-1ubuntu0.4+esm2 | < 1:1.5.1-1ubuntu0.16.04.4+esm2 | < 1:2.0.3-1ubuntu0.1~esm2 | < 1:2.0.3-1ubuntu0.20.04.1~esm2 | < 1:2.0.5-1ubuntu0.2 | < 1:2.0.6-1+deb13u1build0.24.04.2 | All versions (No fix recorded) | < 1:2.0.6-2ubuntu0.2","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libxfont2","name":"libxfont2","label":"libxfont2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libxfont2","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"x","product":"libxfont","name":"libxfont","label":"libxfont","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.0.0, < 2.0.8","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.0.0, < 2.0.8","eol":null,"hubHref":"/vendor/x/libxfont"},{"vendor":"x.org","product":"libxfont2","name":"libXfont2","label":"libxfont2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.0.8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.0.8","eol":null,"hubHref":"/vendor/xorg/libxfont2"}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.openwall.com/lists/oss-security/2026/07/08/1","label":"www.openwall.com/lists/oss-security/2026/07/08/1","hostname":"www.openwall.com","tags":["Vendor Advisory","REPORT","Mailing List","Patch","Third Party Advisory"]},{"url":"https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/be0b08e2d354138d3222b4490e2a77c6ee42f778","label":"gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/be0b08e2d354138d3222b4490e2a77c6ee42f778","hostname":"gitlab.freedesktop.org","tags":["Patch"]},{"url":"https://ubuntu.com/security/CVE-2026-56001","label":"ubuntu.com/security/CVE-2026-56001","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-56001","label":"www.cve.org/CVERecord?id=CVE-2026-56001","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8560-1","label":"ubuntu.com/security/notices/USN-8560-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-56001","label":"security-tracker.debian.org/tracker/CVE-2026-56001","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56001","label":"nvd.nist.gov/vuln/detail/CVE-2026-56001","hostname":"nvd.nist.gov","tags":["Oval","Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2026-0311","OPENSUSE-SU-2026:11233-1","OPENSUSE-SU-2026:21284-1","RHSA-2026:47079","RHSA-2026:47084","RHSA-2026:47103","RHSA-2026:51058","RHSA-2026:51059","RHSA-2026:51060","RHSA-2026:51061","RHSA-2026:51062","RHSA-2026:51063","RHSA-2026:51066","RHSA-2026:51067","SUSE-SU-2026:22614-1","SUSE-SU-2026:2793-1","SUSE-SU-2026:2794-1","USN-8560-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11233-1","OPENSUSE-SU-2026:21284-1","SUSE-SU-2026:22614-1","SUSE-SU-2026:2793-1","SUSE-SU-2026:2794-1","USN-8560-1"]},"timeline":[{"kind":"published","date":"2026-07-08T08:49:24.706Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-09T03:55:45.984Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T22:45:33.817Z","stale":false,"partial":false}}