{"id":"CVE-2026-101616","kind":"vulnerability","aliases":["CVE-2026-101616"],"related":[],"title":"MySQL Server JSON component flaw lets low-privilege users crash the server","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: JSON).  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 JSON component of MySQL Server and MySQL Cluster lets an authenticated low-privilege user hang or repeatedly crash the server over the network. The sources describe only availability impact, so an attacker can take the database down but not read or change data.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["databases","mysql","package","self-hosted"],"not_affected_if":["auth-required","managed-hosting"],"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":"- Upgrade MySQL Server and MySQL Cluster to a release that includes Oracle's July 2026 Critical Patch Update fix (the sources do not name the fixed version numbers).\n- Until patched, limit which accounts can connect to the server.","status":"open","published_at":"2026-10-20T22:18:15+00:00","first_seen_at":"2026-10-23T21:57:22+00:00","triaged_at":"2026-10-25T03:55:09+00:00","updated_at":"2026-10-25T03:55:09+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T03:55:09Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade MySQL Server and MySQL Cluster to a release that includes Oracle's July 2026 Critical Patch Update fix (the sources do not name the fixed version numbers).\n- Until patched, limit which accounts can connect to the server.","reach":"network","title":"MySQL Server JSON component flaw lets low-privilege users crash the server","impact":"medium","summary":"A flaw in the JSON component of MySQL Server and MySQL Cluster lets an authenticated low-privilege user hang or repeatedly crash the server over the network. The sources describe only availability impact, so an attacker can take the database down but not read or change data.","category":"package","nicknames":[],"who_cares":["mysql","databases","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Authenticated user crashes or hangs the MySQL server repeatedly.","analyst_note":"Fixed version numbers are not in the sources; check Oracle's MySQL security alert for the patched releases.","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":true,"not_affected_if":["managed-hosting","auth-required"],"who_is_affected":"Any deployment running an affected MySQL Server or MySQL Cluster version where an attacker can reach the database port with a low-privilege account. Instances that accept connections only from trusted application hosts with no untrusted accounts are at lower risk. Managed database services handle their own patching.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000689,"input_tokens":3581,"output_tokens":662,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101616':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':62B,119C,133C 'authent':40B 'avail':58B,162C 'base':159C 'caus':143C 'chang':72B 'cluster':37B,80C,103C,131C,156C 'complet':150C 'compon':4A,31B,85C 'compromis':127C 'crash':11A,48B,149C 'cve':14A,17A 'cvss':157C,164C,166C 'data':73B 'databas':20B,66B 'describ':56B 'dos':151C 'easili':113C 'exploit':114C 'flaw':5A,27B 'frequent':147C 'h':176C 'hang':45B,145C 'host':25B 'impact':59B,163C 'json':3A,30B,87C 'l/pr':170C 'l/ui':171C 'let':6A,38B 'low':8A,42B,117C 'low-privileg':7A,41B 'multipl':124C 'mysql':1A,21B,33B,36B,77C,79C,84C,94C,102C,128C,130C,153C,155C 'n/a':175C 'n/ac':169C 'n/i':174C 'n/s':172C 'network':53B,121C 'oracl':83C 'packag':22B 'privileg':9A,43B,118C 'product':81C 'protocol':125C 'read':70B 'repeat':47B,148C 'result':138C 'score':160C 'self':24B 'self-host':23B 'server':2A,13A,34B,50B,78C,86C,95C,129C,154C 'sourc':55B 'success':132C 'support':88C 'take':64B 'u/c':173C 'unauthor':140C 'user':10A,44B 'vector':165C 'version':89C 'via':123C 'vulner':74C,115C,136C","nicknames":[],"mitigations":[],"who_affected":"Any deployment running an affected MySQL Server or MySQL Cluster version where an attacker can reach the database port with a low-privilege account. Instances that accept connections only from trusted application hosts with no untrusted accounts are at lower risk. Managed database services handle their own patching.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:15+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-2026-101616","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101616","severity":null,"published_at":"2026-10-20T22:18:15+00:00","modified_at":"2026-10-21T18:43:53+00:00","first_seen_at":"2026-10-23T21:57:22+00:00","fetched_at":"2026-10-23T22:28:58+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"}