CVE-2026-101781

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{"bugzilla": {"description": "mysql: mysql: Server takeover via Group Replication GCS", "id": "2557856", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2557856"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-306", "details": ["A flaw was found in MySQL's Group Replication Group Communication System (GCS). An unauthenticated attacker located on the same adjacent network segment can exploit this vulnerability without requiring privileges or user interaction. Successful exploitation allows the attacker to take over the MySQL server, leading to unauthorized data disclosure, data modification, and denial of service."], "name": "CVE-2026-101781", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "mysql8.4", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "mysql", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "mysql", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "mariadb10.11", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "mariadb11.8", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-20T21:22:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-101781\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-101781\nhttps://www.oracle.com/security-alerts/cpuoct2026.html"], "statement": "This vulnerability is rated as Important because an unauthenticated adjacent attacker can achieve complete system compromise without requiring prior privileges or user interaction. Standard MySQL installations on Red Hat Enterprise Linux do not enable Group Replication by default, leaving typical standalone deployments unaffected. Risk is confined to environments where Group Replication is actively configured and group communication ports are accessible from untrusted adjacent networks.", "threat_severity": "Important"}

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