{"schemaVersion":3,"id":"CVE-2026-107778","aliases":["DEBIAN-CVE-2026-107778","UBUNTU-CVE-2026-107778"],"status":"published","duplicateOf":null,"title":null,"description":"MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.","dates":{"published":"2026-10-08T20:15:54.159Z","modified":"2026-10-09T11:50:03.488Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":7.2,"impact":6,"computed":true}]},"epss":{"probability":0.00424,"percentile":0.35294,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-09T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00424,"percentile":0.35294}],"last30":[{"date":"2026-10-09T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00424,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00424,"percentile":0.35294}]},"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-476","name":"NULL Pointer Dereference","description":"The product dereferences a pointer that it expects to be valid but is NULL.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/476.html"}],"affected":[{"vendor":"debian","product":"krb5","name":"krb5","label":"krb5","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/krb5","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"krb5","name":"krb5","label":"krb5","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/krb5","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"mit","product":"krb5","name":"krb5","label":"krb5","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 1.22.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 1.22.2","eol":null,"hubHref":"/vendor/mit/krb5"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/krb5/krb5/pull/1511","label":"github.com/krb5/krb5/pull/1511","hostname":"github.com","tags":["Issue Tracking","Patch","REPORT"]},{"url":"https://github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08","label":"github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08","hostname":"github.com","tags":["Patch","REPORT"]},{"url":"https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a","label":"github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a","hostname":"github.com","tags":["Patch","REPORT"]},{"url":"https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c#L77-L112","label":"github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c","hostname":"github.com","tags":["Technical Description","REPORT"]},{"url":"https://github.com/krb5/krb5","label":"github.com/krb5/krb5","hostname":"github.com","tags":["Product","REPORT"]},{"url":"https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-rd-cred","label":"www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-rd-cred","hostname":"www.vulncheck.com","tags":["Third Party Advisory","REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-107778","label":"security-tracker.debian.org/tracker/CVE-2026-107778","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-107778","label":"ubuntu.com/security/CVE-2026-107778","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-107778","label":"www.cve.org/CVERecord?id=CVE-2026-107778","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:80481"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-08T20:15:54.159Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-09T11:50:03.488Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":28,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T16:05:50.859Z","stale":false,"partial":false}}