{"id":"CVE-2026-101732","kind":"vulnerability","aliases":["CVE-2026-101732"],"related":[],"title":"MySQL Server optimizer flaw lets a privileged user crash the database","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Optimizer).  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 MySQL Server optimizer lets a highly privileged attacker over the network cause a hang or repeatable crash of MySQL Server and MySQL Cluster. 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":["database","mysql","mysql-cluster","package","self-hosted"],"not_affected_if":["unaffected-version"],"how_to_check":"- Run `SELECT @@version;` on each MySQL Server and MySQL Cluster node and compare against the affected ranges: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1 for MySQL Server, and 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1 for MySQL Cluster.","fix":"- Upgrade MySQL Server and MySQL Cluster to a release outside the affected ranges, as published in Oracle's April 2026 Critical Patch Update (exact fixed version unknown from the sources).","status":"open","published_at":"2026-10-20T22:18:28+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","triaged_at":"2026-10-25T04:31:22+00:00","updated_at":"2026-10-25T04:31:22+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T04:31:22Z","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 April 2026 Critical Patch Update (exact fixed version unknown from the sources).","reach":"network","title":"MySQL Server optimizer flaw lets a privileged user crash the database","impact":"low","summary":"A flaw in the MySQL Server optimizer lets a highly privileged attacker over the network cause a hang or repeatable crash of MySQL Server and MySQL Cluster. The sources describe only availability impact, with no data read or code execution.","category":"package","nicknames":[],"who_cares":["mysql","mysql-cluster","self-hosted","database"],"confidence":0.7,"needs_auth":"yes","worst_case":"Database server hangs or crashes repeatedly, causing denial of service.","analyst_note":"Confirm the fixed version in Oracle's April 2026 CPU advisory and the exact patch release for each supported branch.","how_to_check":"- Run `SELECT @@version;` on each MySQL Server and MySQL Cluster node and compare against the affected ranges: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1 for MySQL Server, and 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1 for MySQL Cluster.","needs_analyst":true,"not_affected_if":["unaffected-version"],"who_is_affected":"Teams running MySQL Server or MySQL Cluster in the affected version ranges. The attacker needs high privileges and network access, so exposure is mainly where many accounts hold broad rights or the database is reachable from untrusted networks. Teams on versions outside the listed ranges can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000692,"input_tokens":3585,"output_tokens":666,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101732':14A,17A '-2026':13A,16A '/av':161C '26.7.0':93C,104C '26.7.1':94C,105C '3.1':151C,160C '4.9':154C '8.0.0':97C '8.0.49':98C '8.4.0':89C,99C '8.4.12':90C,100C '9.7.0':91C,101C '9.7.3':92C,102C 'abil':134C 'access':115C 'affect':85C 'allow':109C 'attack':38B,112C,126C 'avail':58B,155C 'base':152C 'caus':42B,136C 'cluster':22B,53B,73C,96C,124C,149C 'code':65B 'complet':143C 'compon':78C 'compromis':120C 'crash':9A,47B,142C 'cve':12A,15A 'cvss':150C,157C,159C 'data':62B 'databas':11A,18B 'describ':56B 'dos':144C 'easili':106C 'execut':66B 'exploit':107C 'flaw':4A,28B 'frequent':140C 'h':169C 'h/ui':164C 'hang':44B,138C 'high':36B,110C 'host':26B 'impact':59B,156C 'l/pr':163C 'let':5A,34B 'multipl':117C 'mysql':1A,19B,21B,31B,49B,52B,70C,72C,77C,87C,95C,121C,123C,146C,148C 'mysql-clust':20B 'n/a':168C 'n/ac':162C 'n/i':167C 'n/s':165C 'network':41B,114C 'optim':3A,33B,80C 'oracl':76C 'packag':23B 'privileg':7A,37B,111C 'product':74C 'protocol':118C 'read':63B 'repeat':46B,141C 'result':131C 'score':153C 'self':25B 'self-host':24B 'server':2A,32B,50B,71C,79C,88C,122C,147C 'sourc':55B 'success':125C 'support':81C 'u/c':166C 'unauthor':133C 'user':8A 'vector':158C 'version':82C 'via':116C 'vulner':67C,108C,129C","nicknames":[],"mitigations":[],"who_affected":"Teams running MySQL Server or MySQL Cluster in the affected version ranges. The attacker needs high privileges and network access, so exposure is mainly where many accounts hold broad rights or the database is reachable from untrusted networks. Teams on versions outside the listed ranges can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:28+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-2026-101732","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101732","severity":null,"published_at":"2026-10-20T22:18:28+00:00","modified_at":"2026-10-22T18:17:17+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"}