{"id":"CVE-2026-101728","kind":"vulnerability","aliases":["CVE-2026-101728"],"related":[],"title":"MySQL Server: low-privileged network user can crash the server repeatedly","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. Easily exploitable vulnerability allows low privileged 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. CVSS 3.1 Base Score 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).","summary":"A low-privileged user with network access can trigger a hang or repeatable crash in MySQL Server and MySQL Cluster through the Pluggable Auth component. The attacker gets denial of service only, with no read or write of data.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["database","mysql","network-exposed","package","self-hosted"],"not_affected_if":["no-network-clients","version-outside-range"],"how_to_check":"- Run `SELECT VERSION();` on the server and compare against the affected ranges: 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, 26.7.0 through 26.7.1, and MySQL Cluster 8.0.0 through 8.0.49.","fix":"- Move MySQL Server 8.4.x to a release after `8.4.12`, 9.7.x to a release after `9.7.3`, and 26.7.x to a release after `26.7.1`.\n- Move MySQL Cluster 8.0.x to a release after `8.0.49`.\n- Apply the Oracle Critical Patch Update fix for this CVE; the exact fixed build numbers are unknown from the sources.","status":"open","published_at":"2026-10-20T22:18:27+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","triaged_at":"2026-10-25T03:54:58+00:00","updated_at":"2026-10-25T03:54:58+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T03:54:58Z","model":"claude-haiku-5-5","output":{"fix":"- Move MySQL Server 8.4.x to a release after `8.4.12`, 9.7.x to a release after `9.7.3`, and 26.7.x to a release after `26.7.1`.\n- Move MySQL Cluster 8.0.x to a release after `8.0.49`.\n- Apply the Oracle Critical Patch Update fix for this CVE; the exact fixed build numbers are unknown from the sources.","reach":"network","title":"MySQL Server: low-privileged network user can crash the server repeatedly","impact":"low","summary":"A low-privileged user with network access can trigger a hang or repeatable crash in MySQL Server and MySQL Cluster through the Pluggable Auth component. The attacker gets denial of service only, with no read or write of data.","category":"package","nicknames":[],"who_cares":["mysql","self-hosted","database","network-exposed"],"confidence":0.7,"needs_auth":"yes","worst_case":"Repeatable server crash or hang causing full denial of service","analyst_note":"","how_to_check":"- Run `SELECT VERSION();` on the server and compare against the affected ranges: 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, 26.7.0 through 26.7.1, and MySQL Cluster 8.0.0 through 8.0.49.","needs_analyst":false,"not_affected_if":["version-outside-range","no-network-clients"],"who_is_affected":"Teams that run MySQL Server or MySQL Cluster in the affected version ranges and let clients reach the server over the network. Exposure depends on whether untrusted or low-privileged accounts can connect. Servers only reachable by trusted application accounts on a private network carry less risk.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000675,"input_tokens":3591,"output_tokens":632,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101728':15A,18A '-2026':14A,17A '/av':163C '26.7.0':95C,106C '26.7.1':96C,107C '3.1':153C,162C '6.5':156C '8.0.0':99C '8.0.49':100C '8.4.0':91C,101C '8.4.12':92C,102C '9.7.0':93C,103C '9.7.3':94C,104C 'abil':136C 'access':35B,117C 'affect':87C 'allow':111C 'attack':55B,114C,128C 'auth':52B,82C 'avail':157C 'base':154C 'caus':138C 'cluster':48B,74C,98C,126C,151C 'complet':145C 'compon':53B,79C 'compromis':122C 'crash':9A,42B,144C 'cve':13A,16A 'cvss':152C,159C,161C 'data':67B 'databas':19B 'denial':57B 'dos':146C 'easili':108C 'exploit':109C 'expos':23B 'frequent':142C 'get':56B 'h':171C 'hang':39B,140C 'host':27B 'impact':158C 'l/pr':165C 'l/ui':166C 'low':4A,30B,112C 'low-privileg':3A,29B 'multipl':119C 'mysql':1A,20B,44B,47B,71C,73C,78C,89C,97C,123C,125C,148C,150C 'n/a':170C 'n/ac':164C 'n/i':169C 'n/s':167C 'network':6A,22B,34B,116C 'network-expos':21B 'oracl':77C 'packag':24B 'pluggabl':51B,81C 'privileg':5A,31B,113C 'product':75C 'protocol':120C 'read':63B 'repeat':12A,41B,143C 'result':133C 'score':155C 'self':26B 'self-host':25B 'server':2A,11A,45B,72C,80C,90C,124C,149C 'servic':59B 'success':127C 'support':83C 'trigger':37B 'u/c':168C 'unauthor':135C 'user':7A,32B 'vector':160C 'version':84C 'via':118C 'vulner':68C,110C,131C 'write':65B","nicknames":[],"mitigations":[],"who_affected":"Teams that run MySQL Server or MySQL Cluster in the affected version ranges and let clients reach the server over the network. Exposure depends on whether untrusted or low-privileged accounts can connect. Servers only reachable by trusted application accounts on a private network carry less risk.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:27+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_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-101728","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101728","severity":null,"published_at":"2026-10-20T22:18:27+00:00","modified_at":"2026-10-22T18:17:16+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"}