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{"bugzilla": {"description": "mysql: Group Replication Plugin unspecified vulnerability (CPU Apr 2026)", "id": "2460358", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460358"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["Oracle CPU describes the issue as following: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server."], "name": "CVE-2026-34270", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "mysql8.4", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "mysql", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "mysql:8.0/mysql", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "mysql:8.4/mysql", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "mysql", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "mysql:8.4/mysql", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34270\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34270\nhttps://www.oracle.com/security-alerts/cpuapr2026.html\nhttps://www.oracle.com/security-alerts/cpuapr2026.html#AppendixMSQL"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Oracle MySQL Critical Patch Update.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.0.0,8.0.45]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.4.0,8.4.8]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.6.0]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "MySQL Server", "source": "cna", "vendor": "Oracle Corporation"}, "product": "mysql_server", "vendor": "oracle"}], "analysis": {"en": {"generated_at": "2026-04-27T19:39:34.281317+00:00", "value": {"mitigation_remediation": ["Update Oracle MySQL Server to a version newer than 8.0.45, 8.4.8, or 9.6.0, which contain the fixed Group Replication Plugin.", "If Group Replication is not required, remove or disable the plugin to eliminate the attack surface.", "Restrict network access to the MySQL instance to trusted hosts and consider applying firewall rules to block unnecessary ports, thereby limiting low\u2011privilege attacker reach."], "summary": {"action": "Patch", "impact": "Availability (Denial of Service)"}, "threat_synthesis": {"affected_systems": "Oracle MySQL Server 8.0.0 through 8.0.45, 8.4.0 through 8.4.8, and 9.0.0 through 9.6.0 are affected. Any installation of the Group Replication Plugin in these versions can be impacted.", "description_and_impact": "The flaw resides in the Group Replication Plugin of Oracle MySQL Server. An attacker with low privileges and network connectivity can trigger a hang or repeatable crash that takes the server offline. The exploit does not grant further compromise and only corrupts availability, as reflected by the CVSS 3.1 vector AV:N/AC:L/PR:L/C:N/I:N/A:H.", "risk_and_exploitability": "The CVSS base score of 6.5 indicates a moderate risk to availability, while the reported EPSS score of 0.0004 (<1%) indicates a very low but nonzero exploitation probability. The vulnerability is not yet in the CISA KEV catalog. Attackers can reach the vulnerable code via the standard MySQL protocols over the network, using a low\u2011privilege account to execute the crash trigger."}}}}, "created": "2026-04-22T02:00:04.891151+00:00", "updated": "2026-04-27T19:45:11.342639+00:00", "vendors": ["oracle", "oracle$PRODUCT$mysql_server"]}