{"schema_version":"1.7.2","id":"OESA-2026-2257","modified":"2026-05-09T12:33:25Z","published":"2026-05-09T12:33:25Z","upstream":["CVE-2026-40355","CVE-2026-40356"],"summary":"krb5 security update","details":"Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography.\r\n\r\nSecurity Fix(es):\n\nIn MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message.(CVE-2026-40355)\n\nIn MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to terminate in parse_message.(CVE-2026-40356)","affected":[{"package":{"ecosystem":"openEuler:24.03-LTS-SP1","name":"krb5","purl":"pkg:rpm/openEuler/krb5&distro=openEuler-24.03-LTS-SP1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-20.oe2403sp1"}]}],"ecosystem_specific":{"aarch64":["krb5-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-client-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-debuginfo-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-debugsource-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-devel-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-libs-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-server-1.21.2-20.oe2403sp1.aarch64.rpm"],"noarch":["krb5-help-1.21.2-20.oe2403sp1.noarch.rpm"],"src":["krb5-1.21.2-20.oe2403sp1.src.rpm"],"x86_64":["krb5-1.21.2-20.oe2403sp1.x86_64.rpm","krb5-client-1.21.2-20.oe2403sp1.x86_64.rpm","krb5-debuginfo-1.21.2-20.oe2403sp1.x86_64.rpm","krb5-debugsource-1.21.2-20.oe2403sp1.x86_64.rpm","krb5-devel-1.21.2-20.oe2403sp1.x86_64.rpm","krb5-libs-1.21.2-20.oe2403sp1.x86_64.rpm","krb5-server-1.21.2-20.oe2403sp1.x86_64.rpm"]}},{"package":{"ecosystem":"openEuler:24.03-LTS-SP3","name":"krb5","purl":"pkg:rpm/openEuler/krb5&distro=openEuler-24.03-LTS-SP3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-20.oe2403sp3"}]}],"ecosystem_specific":{"aarch64":["krb5-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-client-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-debuginfo-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-debugsource-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-devel-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-libs-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-server-1.21.2-20.oe2403sp3.aarch64.rpm"],"noarch":["krb5-help-1.21.2-20.oe2403sp3.noarch.rpm"],"src":["krb5-1.21.2-20.oe2403sp3.src.rpm"],"x86_64":["krb5-1.21.2-20.oe2403sp3.x86_64.rpm","krb5-client-1.21.2-20.oe2403sp3.x86_64.rpm","krb5-debuginfo-1.21.2-20.oe2403sp3.x86_64.rpm","krb5-debugsource-1.21.2-20.oe2403sp3.x86_64.rpm","krb5-devel-1.21.2-20.oe2403sp3.x86_64.rpm","krb5-libs-1.21.2-20.oe2403sp3.x86_64.rpm","krb5-server-1.21.2-20.oe2403sp3.x86_64.rpm"]}},{"package":{"ecosystem":"openEuler:20.03-LTS-SP4","name":"krb5","purl":"pkg:rpm/openEuler/krb5&distro=openEuler-20.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.2-23.oe2003sp4"}]}],"ecosystem_specific":{"aarch64":["krb5-1.18.2-23.oe2003sp4.aarch64.rpm","krb5-client-1.18.2-23.oe2003sp4.aarch64.rpm","krb5-debuginfo-1.18.2-23.oe2003sp4.aarch64.rpm","krb5-debugsource-1.18.2-23.oe2003sp4.aarch64.rpm","krb5-devel-1.18.2-23.oe2003sp4.aarch64.rpm","krb5-libs-1.18.2-23.oe2003sp4.aarch64.rpm","krb5-server-1.18.2-23.oe2003sp4.aarch64.rpm"],"noarch":["krb5-help-1.18.2-23.oe2003sp4.noarch.rpm"],"src":["krb5-1.18.2-23.oe2003sp4.src.rpm"],"x86_64":["krb5-1.18.2-23.oe2003sp4.x86_64.rpm","krb5-client-1.18.2-23.oe2003sp4.x86_64.rpm","krb5-debuginfo-1.18.2-23.oe2003sp4.x86_64.rpm","krb5-debugsource-1.18.2-23.oe2003sp4.x86_64.rpm","krb5-devel-1.18.2-23.oe2003sp4.x86_64.rpm","krb5-libs-1.18.2-23.oe2003sp4.x86_64.rpm","krb5-server-1.18.2-23.oe2003sp4.x86_64.rpm"]}},{"package":{"ecosystem":"openEuler:22.03-LTS-SP4","name":"krb5","purl":"pkg:rpm/openEuler/krb5&distro=openEuler-22.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.2-30.oe2203sp4"}]}],"ecosystem_specific":{"aarch64":["krb5-1.19.2-30.oe2203sp4.aarch64.rpm","krb5-client-1.19.2-30.oe2203sp4.aarch64.rpm","krb5-debuginfo-1.19.2-30.oe2203sp4.aarch64.rpm","krb5-debugsource-1.19.2-30.oe2203sp4.aarch64.rpm","krb5-devel-1.19.2-30.oe2203sp4.aarch64.rpm","krb5-libs-1.19.2-30.oe2203sp4.aarch64.rpm","krb5-server-1.19.2-30.oe2203sp4.aarch64.rpm"],"noarch":["krb5-help-1.19.2-30.oe2203sp4.noarch.rpm"],"src":["krb5-1.19.2-30.oe2203sp4.src.rpm"],"x86_64":["krb5-1.19.2-30.oe2203sp4.x86_64.rpm","krb5-client-1.19.2-30.oe2203sp4.x86_64.rpm","krb5-debuginfo-1.19.2-30.oe2203sp4.x86_64.rpm","krb5-debugsource-1.19.2-30.oe2203sp4.x86_64.rpm","krb5-devel-1.19.2-30.oe2203sp4.x86_64.rpm","krb5-libs-1.19.2-30.oe2203sp4.x86_64.rpm","krb5-server-1.19.2-30.oe2203sp4.x86_64.rpm"]}},{"package":{"ecosystem":"openEuler:24.03-LTS","name":"krb5","purl":"pkg:rpm/openEuler/krb5&distro=openEuler-24.03-LTS"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-20.oe2403"}]}],"ecosystem_specific":{"aarch64":["krb5-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-client-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-debuginfo-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-debugsource-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-devel-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-libs-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-server-1.21.2-20.oe2403sp1.aarch64.rpm","krb5-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-client-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-debuginfo-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-debugsource-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-devel-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-libs-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-server-1.21.2-20.oe2403sp3.aarch64.rpm","krb5-1.21.2-20.oe2403.aarch64.rpm","krb5-client-1.21.2-20.oe2403.aarch64.rp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