{"schema_version":"1.7.2","id":"OESA-2026-4493","modified":"2026-10-22T14:35:47Z","published":"2026-10-22T14:35:47Z","upstream":["CVE-2026-107708","CVE-2026-107778"],"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\nMIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.(CVE-2026-107708)\n\nMIT 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.(CVE-2026-107778)","affected":[{"package":{"ecosystem":"openEuler:24.03-LTS-SP4","name":"krb5","purl":"pkg:rpm/openEuler/krb5&distro=openEuler-24.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-23.oe2403sp4"}]}],"ecosystem_specific":{"aarch64":["krb5-1.21.2-23.oe2403sp4.aarch64.rpm","krb5-client-1.21.2-23.oe2403sp4.aarch64.rpm","krb5-debuginfo-1.21.2-23.oe2403sp4.aarch64.rpm","krb5-debugsource-1.21.2-23.oe2403sp4.aarch64.rpm","krb5-devel-1.21.2-23.oe2403sp4.aarch64.rpm","krb5-libs-1.21.2-23.oe2403sp4.aarch64.rpm","krb5-server-1.21.2-23.oe2403sp4.aarch64.rpm"],"noarch":["krb5-help-1.21.2-23.oe2403sp4.noarch.rpm"],"src":["krb5-1.21.2-23.oe2403sp4.src.rpm"],"x86_64":["krb5-1.21.2-23.oe2403sp4.x86_64.rpm","krb5-client-1.21.2-23.oe2403sp4.x86_64.rpm","krb5-debuginfo-1.21.2-23.oe2403sp4.x86_64.rpm","krb5-debugsource-1.21.2-23.oe2403sp4.x86_64.rpm","krb5-devel-1.21.2-23.oe2403sp4.x86_64.rpm","krb5-libs-1.21.2-23.oe2403sp4.x86_64.rpm","krb5-server-1.21.2-23.oe2403sp4.x86_64.rpm"]}}],"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4493"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107708"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107778"}],"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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"}],"database_specific":{"severity":"Medium"}}