CVE-2026-21968

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{"bugzilla": {"description": "mysql: Optimizer unspecified vulnerability (CPU Jan 2026)", "id": "2431409", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2431409"}, "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"}, "details": ["Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. 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. 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)."], "name": "CVE-2026-21968", "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:8", "fix_state": "Affected", "package_name": "mysql:8.0/mysql", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "mysql:8.4/mysql", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "mysql", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "mysql:8.4/mysql", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-21968\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-21968\nhttps://www.oracle.com/security-alerts/cpujan2026.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"}

{"analysis": {"en": {"generated_at": "2026-04-18T19:54:08.845316+00:00", "value": {"mitigation_remediation": ["Apply the Oracle patch released in the January\u00a02026 CPU advisory to upgrade MySQL Server to the latest releases beyond 8.0.44, 8.4.7, and 9.5.0.", "Restrict network access to the MySQL Server by configuring firewall rules or network segmentation so that only trusted hosts can communicate with the optimizer interface.", "Enable monitoring of MySQL Server status and alert on recurrent hangs or crashes to detect potential exploitation attempts promptly."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Oracle MySQL Server is affected in versions 8.0.0 through 8.0.44, 8.4.0 through 8.4.7, and 9.0.0 through 9.5.0. These ranges encompass the major 8.0, 8.4, and 9.x series of the product.", "description_and_impact": "The vulnerability resides in the optimizer component of Oracle MySQL Server and enables a low\u2011privileged attacker with network access to trigger a server hang or crash repeatedly, resulting in a denial of service. The attack does not provide data exfiltration or privilege escalation; its primary impact is availability reduction due to frequent failures of the database server.", "risk_and_exploitability": "The CVSS 3.1 base score of 6.5 indicates moderate severity with an availability impact only. Based on the description, it is inferred that the attack vector is network\u2011based and can be executed via any protocol that talks to the optimizer interface. The EPSS score of <1% reflects a very low predicted exploitation probability, and the vulnerability is not listed in CISA\u2019s KEV catalog, suggesting no known active exploits. The overall risk is moderate availability disruption, requiring appropriate mitigation."}}}}, "created": "2026-04-18T20:00:09.298601+00:00", "updated": "2026-04-18T20:00:09.298612+00:00", "vendors": []}