{"id":"CVE-2026-101776","kind":"vulnerability","aliases":["CVE-2026-101776"],"related":[],"title":"MySQL Server: Group Replication flaw lets privileged user crash the server","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Group Replication 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 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 plugin of MySQL Server and MySQL Cluster lets a highly privileged user over the network cause a hang or repeatable crash. The impact is denial of service, with no confidentiality or integrity loss stated.","severity":"medium","cvss":4.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["database","group-replication","mysql","package","self-hosted"],"not_affected_if":["auth-required","default-config"],"how_to_check":"- Run `SELECT VERSION();` on the MySQL server and compare against the affected ranges: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1, and MySQL Cluster 8.0.0-8.0.49.\n- Check whether the Group Replication plugin is loaded with `SHOW PLUGINS;` and look for group_replication.","fix":"- Move MySQL Server to a release outside the affected ranges, per Oracle's July 2026 Critical Patch Update (exact fixed versions unknown from the sources).\n- MySQL Cluster: move to a patched 8.0, 8.4 or 9.7 release (exact fixed versions unknown from the sources).","status":"open","published_at":"2026-10-20T22:18:33+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","triaged_at":"2026-10-25T04:31:18+00:00","updated_at":"2026-10-25T04:31:18+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T04:31:18Z","model":"claude-haiku-5-5","output":{"fix":"- Move MySQL Server to a release outside the affected ranges, per Oracle's July 2026 Critical Patch Update (exact fixed versions unknown from the sources).\n- MySQL Cluster: move to a patched 8.0, 8.4 or 9.7 release (exact fixed versions unknown from the sources).","reach":"network","title":"MySQL Server: Group Replication flaw lets privileged user crash the server","impact":"low","summary":"A flaw in the Group Replication plugin of MySQL Server and MySQL Cluster lets a highly privileged user over the network cause a hang or repeatable crash. The impact is denial of service, with no confidentiality or integrity loss stated.","category":"package","nicknames":[],"who_cares":["mysql","self-hosted","database","group-replication"],"confidence":0.7,"needs_auth":"yes","worst_case":"Database server hangs or crashes repeatedly, causing denial of service.","analyst_note":"Confirm the exact fixed versions and whether Group Replication is required to trigger it, from Oracle's CPU advisory.","how_to_check":"- Run `SELECT VERSION();` on the MySQL server and compare against the affected ranges: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1, and MySQL Cluster 8.0.0-8.0.49.\n- Check whether the Group Replication plugin is loaded with `SHOW PLUGINS;` and look for group_replication.","needs_analyst":true,"not_affected_if":["auth-required","default-config"],"who_is_affected":"Teams running MySQL Server or MySQL Cluster in the listed version ranges with the Group Replication plugin in use. Attackers need database credentials with high privileges and network access to the server. Instances on unaffected versions, or without Group Replication, can skip it.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000698,"input_tokens":3593,"output_tokens":677,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101776':14A,17A '-2026':13A,16A '/av':163C '26.7.0':95C,106C '26.7.1':96C,107C '3.1':153C,162C '4.9':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':117C 'affect':87C 'allow':111C 'attack':114C,128C 'avail':157C 'base':154C 'caus':48B,138C 'cluster':39B,73C,98C,126C,151C 'complet':145C 'compon':78C 'compromis':122C 'confidenti':62B 'crash':9A,53B,144C 'cve':12A,15A 'cvss':152C,159C,161C 'databas':18B 'denial':57B 'dos':146C 'easili':108C 'exploit':109C 'flaw':5A,28B 'frequent':142C 'group':3A,20B,31B,80C 'group-repl':19B 'h':171C 'h/ui':166C 'hang':50B,140C 'high':42B,112C 'host':26B 'impact':55B,158C 'integr':64B 'l/pr':165C 'let':6A,40B 'loss':65B 'multipl':119C 'mysql':1A,22B,35B,38B,70C,72C,77C,89C,97C,123C,125C,148C,150C 'n/a':170C 'n/ac':164C 'n/i':169C 'n/s':167C 'network':47B,116C 'oracl':76C 'packag':23B 'plugin':33B,82C 'privileg':7A,43B,113C 'product':74C 'protocol':120C 'repeat':52B,143C 'replic':4A,21B,32B,81C 'result':133C 'score':155C 'self':25B 'self-host':24B 'server':2A,11A,36B,71C,79C,90C,124C,149C 'servic':59B 'state':66B 'success':127C 'support':83C 'u/c':168C 'unauthor':135C 'user':8A,44B 'vector':160C 'version':84C 'via':118C 'vulner':67C,110C,131C","nicknames":[],"mitigations":[],"who_affected":"Teams running MySQL Server or MySQL Cluster in the listed version ranges with the Group Replication plugin in use. Attackers need database credentials with high privileges and network access to the server. Instances on unaffected versions, or without Group Replication, can skip it.","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: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-2026-101776","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101776","severity":null,"published_at":"2026-10-20T22:18:33+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"}