{"id":"CVE-2026-101751","kind":"vulnerability","aliases":["CVE-2026-101751"],"related":[],"title":"MySQL Server: Group Replication flaw lets a privileged user crash the server","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Group Replication GCS).  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 high 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 4.9 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).","summary":"A flaw in the Group Replication GCS component of MySQL Server and MySQL Cluster lets a highly privileged attacker over the network hang or repeatedly crash the database. The sources describe only availability impact, with no data read or code execution.","severity":"medium","cvss":4.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["group-replication","mysql","package","self-hosted"],"not_affected_if":["auth-required","managed-hosting","standalone-server"],"how_to_check":"- Run `SELECT @@version;` in MySQL to see whether the version is in an affected range (8.4.0 to 8.4.12, 9.7.0 to 9.7.3, 26.7.0 to 26.7.1, or MySQL Cluster 8.0.0 to 8.0.49).\n- Check whether Group Replication is enabled with `SELECT * FROM performance_schema.replication_group_members;`","fix":"- Upgrade MySQL Server to a release after the affected ranges listed by Oracle (the sources do not name the fixed version).\n- Upgrade MySQL Cluster 8.0 to a release after 8.0.49 and 8.4 to a release after 8.4.12.","status":"open","published_at":"2026-10-20T22:18:30+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","triaged_at":"2026-10-25T04:31:21+00:00","updated_at":"2026-10-25T04:31:21+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:31:21Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade MySQL Server to a release after the affected ranges listed by Oracle (the sources do not name the fixed version).\n- Upgrade MySQL Cluster 8.0 to a release after 8.0.49 and 8.4 to a release after 8.4.12.","reach":"network","title":"MySQL Server: Group Replication flaw lets a privileged user crash the server","impact":"low","summary":"A flaw in the Group Replication GCS component of MySQL Server and MySQL Cluster lets a highly privileged attacker over the network hang or repeatedly crash the database. The sources describe only availability impact, with no data read or code execution.","category":"package","nicknames":[],"who_cares":["mysql","self-hosted","group-replication"],"confidence":0.6,"needs_auth":"yes","worst_case":"Database server hangs or crashes repeatedly, causing denial of service","analyst_note":"Check Oracle's Critical Patch Update advisory for the exact fixed versions and confirm whether Group Replication must be enabled to be exposed.","how_to_check":"- Run `SELECT @@version;` in MySQL to see whether the version is in an affected range (8.4.0 to 8.4.12, 9.7.0 to 9.7.3, 26.7.0 to 26.7.1, or MySQL Cluster 8.0.0 to 8.0.49).\n- Check whether Group Replication is enabled with `SELECT * FROM performance_schema.replication_group_members;`","needs_analyst":true,"not_affected_if":["standalone-server","auth-required","managed-hosting"],"who_is_affected":"Only deployments that run the Group Replication plugin on an affected MySQL Server or MySQL Cluster version are exposed. Standalone servers without Group Replication are not described as affected, and the attacker needs high privileges on the database.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000694,"input_tokens":3591,"output_tokens":669,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101751':15A,18A '-2026':14A,17A '/av':164C '26.7.0':96C,107C '26.7.1':97C,108C '3.1':154C,163C '4.9':157C '8.0.0':100C '8.0.49':101C '8.4.0':92C,102C '8.4.12':93C,103C '9.7.0':94C,104C '9.7.3':95C,105C 'abil':137C 'access':118C 'affect':88C 'allow':112C 'attack':45B,115C,129C 'avail':59B,158C 'base':155C 'caus':139C 'cluster':40B,74C,99C,127C,152C 'code':66B 'complet':146C 'compon':34B,79C 'compromis':123C 'crash':10A,52B,145C 'cve':13A,16A 'cvss':153C,160C,162C 'data':63B 'databas':54B 'describ':57B 'dos':147C 'easili':109C 'execut':67B 'exploit':110C 'flaw':5A,28B 'frequent':143C 'gcs':33B,83C 'group':3A,20B,31B,81C 'group-repl':19B 'h':172C 'h/ui':167C 'hang':49B,141C 'high':43B,113C 'host':26B 'impact':60B,159C 'l/pr':166C 'let':6A,41B 'multipl':120C 'mysql':1A,22B,36B,39B,71C,73C,78C,90C,98C,124C,126C,149C,151C 'n/a':171C 'n/ac':165C 'n/i':170C 'n/s':168C 'network':48B,117C 'oracl':77C 'packag':23B 'privileg':8A,44B,114C 'product':75C 'protocol':121C 'read':64B 'repeat':51B,144C 'replic':4A,21B,32B,82C 'result':134C 'score':156C 'self':25B 'self-host':24B 'server':2A,12A,37B,72C,80C,91C,125C,150C 'sourc':56B 'success':128C 'support':84C 'u/c':169C 'unauthor':136C 'user':9A 'vector':161C 'version':85C 'via':119C 'vulner':68C,111C,132C","nicknames":[],"mitigations":[],"who_affected":"Only deployments that run the Group Replication plugin on an affected MySQL Server or MySQL Cluster version are exposed. Standalone servers without Group Replication are not described as affected, and the attacker needs high privileges on the database.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:30+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:H/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-2026-101751","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101751","severity":null,"published_at":"2026-10-20T22:18:30+00:00","modified_at":"2026-10-22T18:17:19+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"}