{"id":"UBUNTU-CVE-2026-107708","details":"MIT 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.","modified":"2026-10-17T12:59:48.062320630Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-107708"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-107708"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-107708"},{"type":"REPORT","url":"https://github.com/krb5/krb5/pull/1510"},{"type":"REPORT","url":"https://github.com/krb5/krb5"},{"type":"REPORT","url":"https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.c#L639-L676"},{"type":"REPORT","url":"https://github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86d"},{"type":"REPORT","url":"https://github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-kdc-null-pointer-dereference-via-s4u2proxy-pac"}],"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_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"krb5-admin-server"},{"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_name":"krb5-otp","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"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_version":"1.12+dfsg-2ubuntu5.4+esm7","binary_name":"libgssrpc4"},{"binary_name":"libk5crypto3","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkadm5clnt-mit9","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"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-2026-107708.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_name":"krb5-k5tls","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"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_name":"libgssapi-krb5-2","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"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_version":"1.13.2+dfsg-5ubuntu2.2+esm7","binary_name":"libkadm5clnt-mit9"},{"binary_name":"libkadm5srv-mit9","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"li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