{"id":"CVE-2026-101780","kind":"vulnerability","aliases":["CVE-2026-101780"],"related":[],"title":"MySQL Server X Plugin flaw lets low-privilege users crash the server","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: X Plugin).  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 flaw in the X Plugin component of MySQL Server and MySQL Cluster lets an authenticated low-privilege user over the network cause a hang or repeatable crash. The impact is denial of service only; the sources report no confidentiality or integrity loss.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["database","mysql","mysql-cluster","package","self-hosted"],"not_affected_if":["network-restricted","x-plugin-disabled"],"how_to_check":"- Run `SELECT VERSION();` in MySQL and compare against the affected ranges: 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, 26.7.0-26.7.1.\n- Run `SHOW PLUGINS;` and check whether the X Plugin (mysqlx) is loaded.","fix":"- Upgrade MySQL Server and MySQL Cluster to a release outside the affected ranges, as published in Oracle's advisory (the sources do not name the fixed version).\n- Until patched, disable the X Plugin if it is not needed, or restrict network access to the MySQL X protocol port.","status":"open","published_at":"2026-10-20T22:18:33+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":0.7,"triage":{"at":"2026-10-25T03:53:45Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade MySQL Server and MySQL Cluster to a release outside the affected ranges, as published in Oracle's advisory (the sources do not name the fixed version).\n- Until patched, disable the X Plugin if it is not needed, or restrict network access to the MySQL X protocol port.","reach":"network","title":"MySQL Server X Plugin flaw lets low-privilege users crash the server","impact":"low","summary":"A flaw in the X Plugin component of MySQL Server and MySQL Cluster lets an authenticated low-privilege user over the network cause a hang or repeatable crash. The impact is denial of service only; the sources report no confidentiality or integrity loss.","category":"package","nicknames":[],"who_cares":["mysql","mysql-cluster","self-hosted","database"],"confidence":0.7,"needs_auth":"yes","worst_case":"Repeatable server crash or hang causing full denial of service","analyst_note":"Find the fixed versions and default X Plugin state in Oracle's MySQL security advisory and the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-101780.","how_to_check":"- Run `SELECT VERSION();` in MySQL and compare against the affected ranges: 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, 26.7.0-26.7.1.\n- Run `SHOW PLUGINS;` and check whether the X Plugin (mysqlx) is loaded.","needs_analyst":true,"not_affected_if":["x-plugin-disabled","network-restricted"],"who_is_affected":"Teams running MySQL Server or MySQL Cluster in the affected version ranges with the X Plugin (X Protocol, port 33060 by default) reachable by clients. Systems on older 8.0 or 8.4 patch levels outside the listed ranges, or with the X Plugin disabled and not reachable, are less exposed. The sources do not say which default configuration ships the plugin enabled.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000754,"input_tokens":3585,"output_tokens":790,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101780':16A,19A '-2026':15A,18A '/av':168C '26.7.0':100C,111C '26.7.1':101C,112C '3.1':158C,167C '6.5':161C '8.0.0':104C '8.0.49':105C '8.4.0':96C,106C '8.4.12':97C,107C '9.7.0':98C,108C '9.7.3':99C,109C 'abil':141C 'access':122C 'affect':92C 'allow':116C 'attack':119C,133C 'authent':44B 'avail':162C 'base':159C 'caus':52B,143C 'cluster':24B,41B,79C,103C,131C,156C 'complet':150C 'compon':35B,84C 'compromis':127C 'confidenti':69B 'crash':11A,57B,149C 'cve':14A,17A 'cvss':157C,164C,166C 'databas':20B 'denial':61B 'dos':151C 'easili':113C 'exploit':114C 'flaw':5A,30B 'frequent':147C 'h':176C 'hang':54B,145C 'host':28B 'impact':59B,163C 'integr':71B 'l/pr':170C 'l/ui':171C 'let':6A,42B 'loss':72B 'low':8A,46B,117C 'low-privileg':7A,45B 'multipl':124C 'mysql':1A,21B,23B,37B,40B,76C,78C,83C,94C,102C,128C,130C,153C,155C 'mysql-clust':22B 'n/a':175C 'n/ac':169C 'n/i':174C 'n/s':172C 'network':51B,121C 'oracl':82C 'packag':25B 'plugin':4A,34B,87C 'privileg':9A,47B,118C 'product':80C 'protocol':125C 'repeat':56B,148C 'report':67B 'result':138C 'score':160C 'self':27B 'self-host':26B 'server':2A,13A,38B,77C,85C,95C,129C,154C 'servic':63B 'sourc':66B 'success':132C 'support':88C 'u/c':173C 'unauthor':140C 'user':10A,48B 'vector':165C 'version':89C 'via':123C 'vulner':73C,115C,136C 'x':3A,33B,86C","nicknames":[],"mitigations":[],"who_affected":"Teams running MySQL Server or MySQL Cluster in the affected version ranges with the X Plugin (X Protocol, port 33060 by default) reachable by clients. Systems on older 8.0 or 8.4 patch levels outside the listed ranges, or with the X Plugin disabled and not reachable, are less exposed. The sources do not say which default configuration ships the plugin enabled.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:33+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-2026-101780","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101780","severity":null,"published_at":"2026-10-20T22:18:33+00:00","modified_at":"2026-10-22T18:17:22+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"}