{"id":"CVE-2026-101721","kind":"vulnerability","aliases":["CVE-2026-101721"],"related":[],"title":"MySQL Server: high-privilege user can crash the Components Services component","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Components Services).  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 Server Components Services component of MySQL Server and MySQL Cluster lets a user with high privileges hang or repeatedly crash the server over the network. The sources describe only a denial of service, with no code execution or data exposure.","severity":"medium","cvss":4.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["database","mysql","package","self-hosted"],"not_affected_if":["database-not-network-exposed","version-outside-range"],"how_to_check":"- Run `SELECT VERSION();` on the MySQL server 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.","fix":"- Move MySQL Server or MySQL Cluster to a release newer than the affected ranges above, using the vendor's patched build (the sources do not name the fixed version numbers).","status":"open","published_at":"2026-10-20T22:18:26+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","triaged_at":"2026-10-25T04:31:30+00:00","updated_at":"2026-10-25T04:31:30+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:31:30Z","model":"claude-haiku-5-5","output":{"fix":"- Move MySQL Server or MySQL Cluster to a release newer than the affected ranges above, using the vendor's patched build (the sources do not name the fixed version numbers).","reach":"network","title":"MySQL Server: high-privilege user can crash the Components Services component","impact":"low","summary":"A flaw in the Server Components Services component of MySQL Server and MySQL Cluster lets a user with high privileges hang or repeatedly crash the server over the network. The sources describe only a denial of service, with no code execution or data exposure.","category":"package","nicknames":[],"who_cares":["mysql","self-hosted","database"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker with high privileges crashes or hangs the MySQL server repeatedly.","analyst_note":"","how_to_check":"- Run `SELECT VERSION();` on the MySQL server 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.","needs_analyst":false,"not_affected_if":["version-outside-range","database-not-network-exposed"],"who_is_affected":"Teams running MySQL Server or MySQL Cluster in the listed version ranges. The attacker needs high privileges and network access, so exposure is mainly a concern where many accounts hold elevated rights or the database port is reachable from untrusted networks. Installations on versions outside the listed ranges can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000662,"input_tokens":3583,"output_tokens":607,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101721':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':115C,129C 'avail':158C 'base':155C 'caus':139C 'cluster':38B,75C,99C,127C,152C 'code':64B 'complet':146C 'compon':10A,12A,30B,32B,80C,82C 'compromis':123C 'crash':8A,48B,145C 'cve':13A,16A 'cvss':153C,160C,162C 'data':67B 'databas':19B 'denial':59B 'describ':56B 'dos':147C 'easili':109C 'execut':65B 'exploit':110C 'exposur':68B 'flaw':26B 'frequent':143C 'h':172C 'h/ui':167C 'hang':45B,141C 'high':4A,43B,113C 'high-privileg':3A 'host':24B 'impact':159C 'l/pr':166C 'let':39B 'multipl':120C 'mysql':1A,20B,34B,37B,72C,74C,79C,90C,98C,124C,126C,149C,151C 'n/a':171C 'n/ac':165C 'n/i':170C 'n/s':168C 'network':53B,117C 'oracl':78C 'packag':21B 'privileg':5A,44B,114C 'product':76C 'protocol':121C 'repeat':47B,144C 'result':134C 'score':156C 'self':23B 'self-host':22B 'server':2A,29B,35B,50B,73C,81C,91C,125C,150C 'servic':11A,31B,61B,83C 'sourc':55B 'success':128C 'support':84C 'u/c':169C 'unauthor':136C 'user':6A,41B 'vector':161C 'version':85C 'via':119C 'vulner':69C,111C,132C","nicknames":[],"mitigations":[],"who_affected":"Teams running MySQL Server or MySQL Cluster in the listed version ranges. The attacker needs high privileges and network access, so exposure is mainly a concern where many accounts hold elevated rights or the database port is reachable from untrusted networks. Installations on versions outside the listed ranges can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:26+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-2026-101721","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101721","severity":null,"published_at":"2026-10-20T22:18:26+00:00","modified_at":"2026-10-22T18:17:15+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"}