{"id":"CVE-2026-112318","kind":"vulnerability","aliases":["CVE-2026-112318"],"related":[],"title":"MIT Kerberos kadmind crashes when a policy request has an empty name","description":"The policy RPC stubs in kadmin/server/server_stubs.c in MIT Kerberos 5 (aka krb5) 1.5.3 and later do not reject a NULL policy name decoded by xdr_nullstring(), which allows remote authenticated users to cause a denial of service (kadmind crash via NULL pointer dereference) by sending a policy request with an empty policy name that reaches authorization checks or logging code.","summary":"The kadmin policy RPC stubs in MIT Kerberos 5 1.5.3 and later do not reject a NULL policy name, so a crafted request dereferences a null pointer. An authenticated remote user can crash the kadmind administration daemon, causing denial of service.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","kadmind","kerberos","mit-kerberos","self-hosted"],"not_affected_if":["auth-required"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-09T19:16:40+00:00","first_seen_at":"2026-11-09T19:28:13+00:00","triaged_at":"2026-11-09T19:31:52+00:00","updated_at":"2026-11-09T19:31:52+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-09T19:31:52Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"MIT Kerberos kadmind crashes when a policy request has an empty name","impact":"low","summary":"The kadmin policy RPC stubs in MIT Kerberos 5 1.5.3 and later do not reject a NULL policy name, so a crafted request dereferences a null pointer. An authenticated remote user can crash the kadmind administration daemon, causing denial of service.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["kerberos","mit-kerberos","kadmind","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"kadmind crashes, causing a denial of service for the realm","analyst_note":"Check the NVD entry and the MIT Kerberos advisory for the fixed versions and any stated workaround; the sources given list no product ranges.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["auth-required"],"who_is_affected":"Organisations running MIT Kerberos kadmind, the administration server for a Kerberos realm, from version 1.5.3 onward. Only the kadmind service is exposed; hosts running only the KDC or clients are not described as affected. Sites that do not expose kadmin remotely are less exposed, but the sources do not say more.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000715,"input_tokens":4615,"output_tokens":508,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-112318':15A,18A '-2026':14A,17A '1.5.3':37B,81C '5':36B,78C 'administr':63B 'aka':79C 'allow':96C 'authent':56B,98C 'author':124C 'caus':65B,101C 'check':125C 'code':128C 'craft':49B 'crash':4A,60B,107C 'cve':13A,16A 'daemon':64B 'decod':91C 'denial':66B,103C 'derefer':51B,111C 'empti':11A,119C 'host':27B 'infrastructur':19B 'kadmin':29B 'kadmin/server/server_stubs.c':74C 'kadmind':3A,20B,62B,106C 'kerbero':2A,21B,24B,35B,77C 'krb5':80C 'later':39B,83C 'log':127C 'mit':1A,23B,34B,76C 'mit-kerbero':22B 'name':12A,46B,90C,121C 'null':44B,53B,88C,109C 'nullstr':94C 'pointer':54B,110C 'polici':7A,30B,45B,70C,89C,115C,120C 'reach':123C 'reject':42B,86C 'remot':57B,97C 'request':8A,50B,116C 'rpc':31B,71C 'self':26B 'self-host':25B 'send':113C 'servic':68B,105C 'stub':32B,72C 'user':58B,99C 'via':108C 'xdr':93C","nicknames":[],"mitigations":[],"who_affected":"Organisations running MIT Kerberos kadmind, the administration server for a Kerberos realm, from version 1.5.3 onward. Only the kadmind service is exposed; hosts running only the KDC or clients are not described as affected. Sites that do not expose kadmin remotely are less exposed, but the sources do not say more.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","kadmind","kerberos","medium","mitkerberos","selfhosted"],"campaign_type":null,"search_a":"'-112318':15A,18A '-2026':14A,17A 'crash':4A 'cve':13A,16A 'empti':11A 'kadmind':3A 'kerbero':2A 'mit':1A 'name':12A 'polici':7A 'request':8A","search_b":"'1.5.3':37B '5':36B 'administr':63B 'authent':56B 'caus':65B 'craft':49B 'crash':60B 'daemon':64B 'denial':66B 'derefer':51B 'host':27B 'infrastructur':19B 'kadmin':29B 'kadmind':20B,62B 'kerbero':21B,24B,35B 'later':39B 'mit':23B,34B 'mit-kerbero':22B 'name':46B 'null':44B,53B 'pointer':54B 'polici':30B,45B 'reject':42B 'remot':57B 'request':50B 'rpc':31B 'self':26B 'self-host':25B 'servic':68B 'stub':32B 'user':58B","search_c":"'1.5.3':81C '5':78C 'aka':79C 'allow':96C 'authent':98C 'author':124C 'caus':101C 'check':125C 'code':128C 'crash':107C 'decod':91C 'denial':103C 'derefer':111C 'empti':119C 'kadmin/server/server_stubs.c':74C 'kadmind':106C 'kerbero':77C 'krb5':80C 'later':83C 'log':127C 'mit':76C 'name':90C,121C 'null':88C,109C 'nullstr':94C 'pointer':110C 'polici':70C,89C,115C,120C 'reach':123C 'reject':86C 'remot':97C 'request':116C 'rpc':71C 'send':113C 'servic':105C 'stub':72C 'user':99C 'via':108C 'xdr':93C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-09T19:16:40+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvss_by":"secalert@redhat.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-112318","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112318","severity":null,"published_at":"2026-11-09T19:16:40+00:00","modified_at":"2026-11-09T19:16:40+00:00","first_seen_at":"2026-11-09T19:28:13+00:00","fetched_at":"2026-11-09T19:28:13+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}