{"id":"UBUNTU-CVE-2026-107778","details":"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.","modified":"2026-10-17T12:58:02.656762519Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-107778"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-107778"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-107778"},{"type":"REPORT","url":"https://github.com/krb5/krb5/pull/1511"},{"type":"REPORT","url":"https://github.com/krb5/krb5"},{"type":"REPORT","url":"https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c#L77-L112"},{"type":"REPORT","url":"https://github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08"},{"type":"REPORT","url":"https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-rd-cred"}],"affected":[{"package":{"name":"krb5","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/krb5?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.1+dfsg-6.1ubuntu1","1.11.3+dfsg-3ubuntu2","1.12+dfsg-2ubuntu1","1.12+dfsg-2ubuntu2","1.12+dfsg-2ubuntu3","1.12+dfsg-2ubuntu4","1.12+dfsg-2ubuntu4.2","1.12+dfsg-2ubuntu5","1.12+dfsg-2ubuntu5.1","1.12+dfsg-2ubuntu5.2","1.12+dfsg-2ubuntu5.3","1.12+dfsg-2ubuntu5.4","1.12+dfsg-2ubuntu5.4+esm1","1.12+dfsg-2ubuntu5.4+esm2","1.12+dfsg-2ubuntu5.4+esm3","1.12+dfsg-2ubuntu5.4+esm4","1.12+dfsg-2ubuntu5.4+esm5","1.12+dfsg-2ubuntu5.4+esm6","1.12+dfsg-2ubuntu5.4+esm7"],"ecosystem_specific":{"binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"krb5-gss-samples"},{"binary_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"krb5-kdc"},{"binary_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"krb5-kdc-ldap"},{"binary_name":"krb5-locales","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-multidev","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"krb5-otp"},{"binary_name":"krb5-pkinit","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-user","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libgssrpc4","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libk5crypto3","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"libkadm5clnt-mit9"},{"binary_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"libkadm5srv-mit8"},{"binary_name":"libkadm5srv-mit9","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"libkdb5-7"},{"binary_name":"libkrad0","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkrb5-3","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkrb5support0","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107778.json"}},{"package":{"name":"krb5","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/krb5?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.2+dfsg-2","1.13.2+dfsg-3","1.13.2+dfsg-4","1.13.2+dfsg-5","1.13.2+dfsg-5ubuntu1","1.13.2+dfsg-5ubuntu2","1.13.2+dfsg-5ubuntu2.1","1.13.2+dfsg-5ubuntu2.1+esm1","1.13.2+dfsg-5ubuntu2.2","1.13.2+dfsg-5ubuntu2.2+esm1","1.13.2+dfsg-5ubuntu2.2+esm2","1.13.2+dfsg-5ubuntu2.2+esm3","1.13.2+dfsg-5ubuntu2.2+esm4","1.13.2+dfsg-5ubuntu2.2+esm5","1.13.2+dfsg-5ubuntu2.2+esm6","1.13.2+dfsg-5ubuntu2.2+esm7"],"ecosystem_specific":{"binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7","binary_name":"krb5-gss-samples"},{"binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7","binary_name":"krb5-k5tls"},{"binary_name":"krb5-kdc","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-kdc-ldap","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7","binary_name":"krb5-locales"},{"binary_name":"krb5-multidev","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-otp","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-pkinit","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-user","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7","binary_name":"libgssapi-krb5-2"},{"binary_name":"libgssrpc4","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libk5crypto3","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkadm5clnt-mit9","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkadm5srv-mit9","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkdb5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