{"id":"USN-8585-1","summary":"krb5 vulnerabilities","details":"It was discovered that Kerberos had an integer underflow vulnerability\nin the berval2tl_data() function. An attacker could possibly use this issue\nto cause Kerberos to crash, resulting in a denial of service.\n(CVE-2026-11850)\n\nIt was discovered that Kerberos had vulnerabilities in its NegoEx mechanism\nparsing. A remote attacker could possibly use these issues to cause\nKerberos to crash, resulting in a denial of service. (CVE-2026-40355,\nCVE-2026-40356)","modified":"2026-07-22T21:03:54.636364771Z","published":"2026-07-22T13:04:35Z","related":["UBUNTU-CVE-2026-11850","UBUNTU-CVE-2026-40355","UBUNTU-CVE-2026-40356"],"upstream":["CVE-2026-11850","CVE-2026-40355","CVE-2026-40356","UBUNTU-CVE-2026-11850","UBUNTU-CVE-2026-40355","UBUNTU-CVE-2026-40356"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8585-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-11850"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-40355"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-40356"}],"affected":[{"package":{"name":"krb5","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/krb5?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.2-2ubuntu0.8"}]}],"versions":["1.18.3-6","1.18.3-7","1.19.2-0ubuntu1","1.19.2-1","1.19.2-2","1.19.2-2ubuntu0.1","1.19.2-2ubuntu0.2","1.19.2-2ubuntu0.3","1.19.2-2ubuntu0.4","1.19.2-2ubuntu0.5","1.19.2-2ubuntu0.6","1.19.2-2ubuntu0.7"],"ecosystem_specific":{"binaries":[{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-admin-server"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-gss-samples"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-k5tls"},{"binary_name":"krb5-kdc","binary_version":"1.19.2-2ubuntu0.8"},{"binary_name":"krb5-kdc-ldap","binary_version":"1.19.2-2ubuntu0.8"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-kpropd"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-locales"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-multidev"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-otp"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"krb5-pkinit"},{"binary_name":"krb5-user","binary_version":"1.19.2-2ubuntu0.8"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.19.2-2ubuntu0.8"},{"binary_name":"libgssrpc4","binary_version":"1.19.2-2ubuntu0.8"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"libk5crypto3"},{"binary_name":"libkadm5clnt-mit12","binary_version":"1.19.2-2ubuntu0.8"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"libkadm5srv-mit12"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"libkdb5-10"},{"binary_name":"libkrad0","binary_version":"1.19.2-2ubuntu0.8"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"libkrb5-3"},{"binary_version":"1.19.2-2ubuntu0.8","binary_name":"libkrb5support0"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8585-1.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2026-11850","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-40355"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-40356"}]}}},{"package":{"name":"krb5","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/krb5?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.1-6ubuntu2.7"}]}],"versions":["1.20.1-3ubuntu1","1.20.1-5build1","1.20.1-6ubuntu1","1.20.1-6ubuntu2","1.20.1-6ubuntu2.1","1.20.1-6ubuntu2.2","1.20.1-6ubuntu2.3","1.20.1-6ubuntu2.4","1.20.1-6ubuntu2.5","1.20.1-6ubuntu2.6"],"ecosystem_specific":{"binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.20.1-6ubuntu2.7"},{"binary_name":"krb5-gss-samples","binary_version":"1.20.1-6ubuntu2.7"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"krb5-k5tls"},{"binary_name":"krb5-kdc","binary_version":"1.20.1-6ubuntu2.7"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"krb5-kdc-ldap"},{"binary_name":"krb5-kpropd","binary_version":"1.20.1-6ubuntu2.7"},{"binary_name":"krb5-locales","binary_version":"1.20.1-6ubuntu2.7"},{"binary_name":"krb5-multidev","binary_version":"1.20.1-6ubuntu2.7"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"krb5-otp"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"krb5-pkinit"},{"binary_name":"krb5-user","binary_version":"1.20.1-6ubuntu2.7"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.20.1-6ubuntu2.7"},{"binary_name":"libgssrpc4t64","binary_version":"1.20.1-6ubuntu2.7"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"libk5crypto3"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"libkadm5clnt-mit12"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"libkadm5srv-mit12"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"libkdb5-10t64"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"libkrad0"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"libkrb5-3"},{"binary_version":"1.20.1-6ubuntu2.7","binary_name":"libkrb5support0"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8585-1.json","cves_map":{"cves":[{"id":"CVE-2026-11850","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-40355","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-40356","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:24.04:LTS"}}},{"package":{"name":"krb5","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/krb5?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.22.1-2ubuntu4.1"}]}],"versions":["1.21.3-5ubuntu2","1.22.1-2","1.22.1-2ubuntu2","1.22.1-2ubuntu3","1.22.1-2ubuntu4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.22.1-2ubuntu4.1"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"krb5-gss-samples"},{"binary_name":"krb5-k5tls","binary_version":"1.22.1-2ubuntu4.1"},{"binary_name":"krb5-kdc","binary_version":"1.22.1-2ubuntu4.1"},{"binary_name":"krb5-kdc-ldap","binary_version":"1.22.1-2ubuntu4.1"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"krb5-kpropd"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"krb5-locales"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"krb5-multidev"},{"binary_name":"krb5-otp","binary_version":"1.22.1-2ubuntu4.1"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"krb5-pkinit"},{"binary_name":"krb5-user","binary_version":"1.22.1-2ubuntu4.1"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.22.1-2ubuntu4.1"},{"binary_name":"libgssrpc4t64","binary_version":"1.22.1-2ubuntu4.1"},{"binary_name":"libk5crypto3","binary_version":"1.22.1-2ubuntu4.1"},{"binary_name":"libkadm5clnt-mit12","binary_version":"1.22.1-2ubuntu4.1"},{"binary_name":"libkadm5srv-mit12","binary_version":"1.22.1-2ubuntu4.1"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"libkdb5-10t64"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"libkrad0"},{"binary_version":"1.22.1-2ubuntu4.1","binary_name":"libkrb5-3"},{"binary_name":"libkrb5support0","binary_version":"1.22.1-2ubuntu4.1"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-11850"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-40355"},{"id":"CVE-2026-40356","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:26.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8585-1.json"}}],"schema_version":"1.7.5"}