{"id":"CVE-2026-101774","kind":"vulnerability","aliases":["CVE-2026-101774"],"related":[],"title":"MySQL Server: pluggable authentication flaw allows crash and some data changes","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Pluggable Auth).  Supported versions that are affected are MySQL Server: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1; MySQL Cluster: 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3 and  26.7.0-26.7.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster as well as  unauthorized update, insert or delete access to some of MySQL Server, MySQL Cluster accessible data. CVSS 3.1 Base Score 6.5 (Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H).","summary":"A flaw in the pluggable authentication component of MySQL Server and MySQL Cluster lets an unauthenticated network attacker crash the server repeatedly and modify some accessible data. The attack is hard to carry out, according to the description.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["database","mysql","package","self-hosted"],"not_affected_if":["unknown"],"how_to_check":"- Run `SELECT VERSION();` in the MySQL client and compare against the affected ranges: 8.0.0-8.0.49 (Cluster only), 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1.","fix":"- Move MySQL Server or MySQL Cluster to a release outside the affected ranges, as listed in the Oracle Critical Patch Update advisory (exact fixed versions unknown from these sources).","status":"open","published_at":"2026-10-20T22:18:32+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","triaged_at":"2026-10-25T03:53:45+00:00","updated_at":"2026-10-25T03:53:45+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T03:53:45Z","model":"claude-haiku-5-5","output":{"fix":"- Move MySQL Server or MySQL Cluster to a release outside the affected ranges, as listed in the Oracle Critical Patch Update advisory (exact fixed versions unknown from these sources).","reach":"network","title":"MySQL Server: pluggable authentication flaw allows crash and some data changes","impact":"medium","summary":"A flaw in the pluggable authentication component of MySQL Server and MySQL Cluster lets an unauthenticated network attacker crash the server repeatedly and modify some accessible data. The attack is hard to carry out, according to the description.","category":"package","nicknames":[],"who_cares":["mysql","self-hosted","database"],"confidence":0.6,"needs_auth":"no","worst_case":"Repeatable server crash and unauthorized insert, update or delete of some data","analyst_note":"Confirm the fixed MySQL versions and any required authentication plugin or configuration in Oracle's MySQL CPU advisory for this CVE.","how_to_check":"- Run `SELECT VERSION();` in the MySQL client and compare against the affected ranges: 8.0.0-8.0.49 (Cluster only), 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1.","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Teams running MySQL Server or MySQL Cluster in the affected version ranges that accept network connections. The sources do not say whether specific authentication plugins or configurations are required, so treat any reachable instance as exposed until checked.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000654,"input_tokens":3638,"output_tokens":580,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101774':14A,17A '-2026':13A,16A '/av':177C '26.7.0':89C,100C '26.7.1':90C,101C '3.1':165C,176C '6.5':168C '8.0.0':93C '8.0.49':94C '8.4.0':85C,95C '8.4.12':86C,96C '9.7.0':87C,97C '9.7.3':88C,98C 'abil':130C 'access':49B,111C,154C,162C 'accord':58B 'affect':81C 'allow':6A,106C 'attack':41B,52B,108C,122C 'auth':76C 'authent':4A,29B 'avail':171C 'base':166C 'carri':56B 'caus':132C 'chang':11A 'cluster':36B,68C,92C,120C,145C,161C 'complet':139C 'compon':30B,73C 'compromis':116C 'crash':7A,42B,138C 'cve':12A,15A 'cvss':164C,173C,175C 'data':10A,50B,163C 'databas':18B 'delet':153C 'descript':61B 'difficult':102C 'dos':140C 'exploit':104C 'flaw':5A,25B 'frequent':136C 'h':185C 'h/pr':179C 'hang':134C 'hard':54B 'host':23B 'impact':172C 'insert':151C 'integr':169C 'l/a':184C 'let':37B 'modifi':47B 'multipl':113C 'mysql':1A,19B,32B,35B,65C,67C,72C,83C,91C,117C,119C,142C,144C,158C,160C 'n/ac':178C 'n/i':183C 'n/s':181C 'n/ui':180C 'network':40B,110C 'oracl':71C 'packag':20B 'pluggabl':3A,28B,75C 'product':69C 'protocol':114C 'repeat':45B,137C 'result':127C 'score':167C 'self':22B 'self-host':21B 'server':2A,33B,44B,66C,74C,84C,118C,143C,159C 'success':121C 'support':77C 'u/c':182C 'unauthent':39B,107C 'unauthor':129C,149C 'updat':150C 'vector':174C 'version':78C 'via':112C 'vulner':62C,105C,125C 'well':147C","nicknames":[],"mitigations":[],"who_affected":"Teams running MySQL Server or MySQL Cluster in the affected version ranges that accept network connections. The sources do not say whether specific authentication plugins or configurations are required, so treat any reachable instance as exposed until checked.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:32+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-101774","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101774","severity":null,"published_at":"2026-10-20T22:18:32+00:00","modified_at":"2026-10-22T18:17:21+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","fetched_at":"2026-10-23T22:28:59+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}