{"id":"CVE-2026-112319","kind":"vulnerability","aliases":["CVE-2026-112319"],"related":[],"title":"MIT Kerberos: unbounded XDR decoding lets authenticated users exhaust kadmind memory","description":"The GSS-RPC layer in MIT Kerberos 5 (aka krb5) does not enforce size limits on XDR-decoded data, which allows remote authenticated users to cause a denial of service (memory exhaustion or excessive CPU consumption in kadmind) via crafted RPC requests that trigger unbounded memory allocations during XDR decoding.","summary":"MIT Kerberos 5 (krb5) GSS-RPC decoding does not limit the size of XDR-decoded data, so an attacker can trigger huge allocations. An authenticated remote user can exhaust memory or CPU in 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","krb5","linux"],"not_affected_if":["no-kadmind","unauthenticated-only-clients"],"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":0.5,"triage":{"at":"2026-11-09T19:31:52Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"MIT Kerberos: unbounded XDR decoding lets authenticated users exhaust kadmind memory","impact":"low","summary":"MIT Kerberos 5 (krb5) GSS-RPC decoding does not limit the size of XDR-decoded data, so an attacker can trigger huge allocations. An authenticated remote user can exhaust memory or CPU in the kadmind administration daemon, causing denial of service.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["kerberos","krb5","kadmind","linux"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"kadmind memory or CPU exhausted, denying administration service","analyst_note":"Check the MIT krb5 advisory for affected and fixed versions and whether the flaw is limited to kadmind with GSS-RPC enabled.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-kadmind","unauthenticated-only-clients"],"who_is_affected":"Organizations running MIT Kerberos kadmind, the krb5 administration server, that accept GSS-RPC requests from authenticated users. Hosts that run only the KDC or client tools are not described by the sources as exposed. unknown beyond this.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000714,"input_tokens":4588,"output_tokens":510,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-112319':14A,17A '-2026':13A,16A '5':25B,74C 'administr':60B 'aka':75C 'alloc':47B,114C 'allow':88C 'attack':43B 'authent':7A,49B,90C 'caus':62B,93C 'consumpt':103C 'cpu':56B,102C 'craft':107C 'cve':12A,15A 'daemon':61B 'data':40B,86C 'decod':5A,30B,39B,85C,117C 'denial':63B,95C 'enforc':79C 'excess':101C 'exhaust':9A,53B,99C 'gss':28B,68C 'gss-rpc':27B,67C 'huge':46B 'infrastructur':18B 'kadmind':10A,19B,59B,105C 'kerbero':2A,20B,24B,73C 'krb5':21B,26B,76C 'layer':70C 'let':6A 'limit':33B,81C 'linux':22B 'memori':11A,54B,98C,113C 'mit':1A,23B,72C 'remot':50B,89C 'request':109C 'rpc':29B,69C,108C 'servic':65B,97C 'size':35B,80C 'trigger':45B,111C 'unbound':3A,112C 'user':8A,51B,91C 'via':106C 'xdr':4A,38B,84C,116C 'xdr-decod':37B,83C","nicknames":[],"mitigations":[],"who_affected":"Organizations running MIT Kerberos kadmind, the krb5 administration server, that accept GSS-RPC requests from authenticated users. Hosts that run only the KDC or client tools are not described by the sources as exposed. unknown beyond this.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","kadmind","kerberos","krb5","linux","medium"],"campaign_type":null,"search_a":"'-112319':14A,17A '-2026':13A,16A 'authent':7A 'cve':12A,15A 'decod':5A 'exhaust':9A 'kadmind':10A 'kerbero':2A 'let':6A 'memori':11A 'mit':1A 'unbound':3A 'user':8A 'xdr':4A","search_b":"'5':25B 'administr':60B 'alloc':47B 'attack':43B 'authent':49B 'caus':62B 'cpu':56B 'daemon':61B 'data':40B 'decod':30B,39B 'denial':63B 'exhaust':53B 'gss':28B 'gss-rpc':27B 'huge':46B 'infrastructur':18B 'kadmind':19B,59B 'kerbero':20B,24B 'krb5':21B,26B 'limit':33B 'linux':22B 'memori':54B 'mit':23B 'remot':50B 'rpc':29B 'servic':65B 'size':35B 'trigger':45B 'user':51B 'xdr':38B 'xdr-decod':37B","search_c":"'5':74C 'aka':75C 'alloc':114C 'allow':88C 'authent':90C 'caus':93C 'consumpt':103C 'cpu':102C 'craft':107C 'data':86C 'decod':85C,117C 'denial':95C 'enforc':79C 'excess':101C 'exhaust':99C 'gss':68C 'gss-rpc':67C 'kadmind':105C 'kerbero':73C 'krb5':76C 'layer':70C 'limit':81C 'memori':98C,113C 'mit':72C 'remot':89C 'request':109C 'rpc':69C,108C 'servic':97C 'size':80C 'trigger':111C 'unbound':112C 'user':91C 'via':106C 'xdr':84C,116C 'xdr-decod':83C","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-2026-112319","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112319","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"}