{"id":"RHSA-2026:19357","summary":"Red Hat Security Advisory: krb5 security update","modified":"2026-06-09T10:06:45Z","published":"2026-05-20T10:10:34Z","upstream":["CVE-2026-40355","CVE-2026-40356"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19357"},{"type":"ARTICLE","url":"https://access.redhat.com/security/updates/classification/#important"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2463368"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2463370"},{"type":"ADVISORY","url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_19357.json"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-40355"},{"type":"ADVISORY","url":"https://www.cve.org/CVERecord?id=CVE-2026-40355"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40355"},{"type":"ARTICLE","url":"https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"},{"type":"ARTICLE","url":"https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f"},{"type":"ARTICLE","url":"https://web.mit.edu/kerberos/advisories/"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-40356"},{"type":"ADVISORY","url":"https://www.cve.org/CVERecord?id=CVE-2026-40356"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40356"}],"affected":[{"package":{"name":"krb5","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-debugsource","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-debugsource"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-devel","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-devel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-libs","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-libs"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-libs-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-libs-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-pkinit","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-pkinit"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-pkinit-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-pkinit-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-server-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server-ldap","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-server-ldap"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server-ldap-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-server-ldap-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-workstation","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-workstation"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-workstation-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-workstation-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-xrealmauthz","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-xrealmauthz"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-xrealmauthz-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/krb5-xrealmauthz-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"libkadm5","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/libkadm5"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"libkadm5-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::appstream","purl":"pkg:rpm/redhat/libkadm5-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-debugsource","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-debugsource"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-devel","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-devel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-libs","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-libs"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-libs-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-libs-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-pkinit","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-pkinit"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-pkinit-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-pkinit-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-server-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server-ldap","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-server-ldap"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-server-ldap-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-server-ldap-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-workstation","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-workstation"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-workstation-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-workstation-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-xrealmauthz","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-xrealmauthz"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"krb5-xrealmauthz-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/krb5-xrealmauthz-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"libkadm5","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/libkadm5"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}},{"package":{"name":"libkadm5-debuginfo","ecosystem":"Red Hat:enterprise_linux:9::baseos","purl":"pkg:rpm/redhat/libkadm5-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.21.1-10.el9_8"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:19357.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}