{"id":"CVE-2026-101803","kind":"vulnerability","aliases":["CVE-2026-101803"],"related":[],"title":"MySQL Server: XML component flaw lets a privileged user crash or alter data","description":"Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: XML).  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 creation, deletion or modification access to critical data or all MySQL Server, MySQL Cluster accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 6.5 (Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H).","summary":"A flaw in the XML component of MySQL Server and MySQL Cluster lets a highly privileged attacker over the network modify data and repeatedly crash the server. The sources give a CVSS 3.1 score of 6.5 with integrity and availability impact only.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["database","mysql","package","self-hosted"],"not_affected_if":["auth-required"],"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\n- Confirm whether the server is reachable from untrusted networks","fix":null,"status":"open","published_at":"2026-10-20T22:18:36+00:00","first_seen_at":"2026-10-23T21:57:23+00:00","triaged_at":"2026-10-25T03:53:37+00:00","updated_at":"2026-10-25T03:53:37+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T03:53:37Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"MySQL Server: XML component flaw lets a privileged user crash or alter data","impact":"medium","summary":"A flaw in the XML component of MySQL Server and MySQL Cluster lets a highly privileged attacker over the network modify data and repeatedly crash the server. The sources give a CVSS 3.1 score of 6.5 with integrity and availability impact only.","category":"package","nicknames":[],"who_cares":["mysql","self-hosted","database"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker with high privileges alters data or crashes the server repeatedly","analyst_note":"Find the Oracle security alert and patched MySQL versions for the listed ranges, and confirm the XML component details.","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\n- Confirm whether the server is reachable from untrusted networks","needs_analyst":true,"not_affected_if":["auth-required"],"who_is_affected":"Teams running MySQL Server or MySQL Cluster in the listed version ranges. The attacker must hold high privileges, so servers where only tightly controlled administrator accounts can connect carry less risk. The sources do not name a patched version.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000655,"input_tokens":3626,"output_tokens":584,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101803':16A,19A '-2026':15A,18A '/av':181C '26.7.0':93C,104C '26.7.1':94C,105C '3.1':58B,169C,180C '6.5':61B,172C '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':152C 'access':115C,138C,148C 'affect':85C 'allow':109C 'alter':12A 'attack':42B,112C,126C 'avail':65B,175C 'base':170C 'caus':154C 'cluster':37B,73C,96C,124C,147C,167C 'complet':161C 'compon':4A,31B,78C 'compromis':120C 'crash':10A,50B,160C 'creation':134C 'critic':140C 'cve':14A,17A 'cvss':57B,168C,177C,179C 'data':13A,47B,141C,149C 'databas':20B 'delet':135C 'dos':162C 'easili':106C 'exploit':107C 'flaw':5A,27B 'frequent':158C 'give':55B 'h':189C 'h/a':188C 'h/ui':184C 'hang':156C 'high':40B,110C 'host':25B 'impact':66B,176C 'integr':63B,173C 'l/pr':183C 'let':6A,38B 'modif':137C 'modifi':46B 'multipl':117C 'mysql':1A,21B,33B,36B,70C,72C,77C,87C,95C,121C,123C,144C,146C,164C,166C 'n/ac':182C 'n/i':187C 'n/s':185C 'network':45B,114C 'oracl':76C 'packag':22B 'privileg':8A,41B,111C 'product':74C 'protocol':118C 'repeat':49B,159C 'result':131C 'score':59B,171C 'self':24B 'self-host':23B 'server':2A,34B,52B,71C,79C,88C,122C,145C,165C 'sourc':54B 'success':125C 'support':81C 'u/c':186C 'unauthor':133C,151C 'user':9A 'vector':178C 'version':82C 'via':116C 'vulner':67C,108C,129C 'xml':3A,30B,80C","nicknames":[],"mitigations":[],"who_affected":"Teams running MySQL Server or MySQL Cluster in the listed version ranges. The attacker must hold high privileges, so servers where only tightly controlled administrator accounts can connect carry less risk. The sources do not name a patched version.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:36+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-101803","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101803","severity":null,"published_at":"2026-10-20T22:18:36+00:00","modified_at":"2026-10-22T18:17:24+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"}