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{"bugzilla": {"description": "mysql: JSON unspecified vulnerability (CPU Apr 2026)", "id": "2460326", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460326"}, "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: JSON). 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-2026-34308", "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": "2026-04-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34308\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34308\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": "2026-04-22T08:22:02.266066+00:00", "value": {"mitigation_remediation": ["Apply the security patch released in the Oracle CPU Apr\u00a02026 advisory to all affected MySQL Server instances.", "After applying the patch, restart the MySQL Server and verify that the JSON module starts correctly.", "Restrict MySQL network access to trusted hosts or networks until all systems are fully patched and verified."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Oracle Corporation\u2019s MySQL Server product is affected. Version ranges include 8.0.0 through 8.0.45, 8.4.0 through 8.4.8, and 9.0.0 through 9.6.0. All installations that use the JSON module within these release ranges are at risk.", "description_and_impact": "A flaw in the JSON handling module of Oracle MySQL Server allows a low-privileged attacker with network connectivity to send malformed JSON data that forces the server to hang or crash repeatedly, causing a denial-of-service.\nThe weakness is one of resource exhaustion, allowing the attacker to repeatedly consume server resources until the instance becomes unresponsive.\nThe associated CVSS vector confirms a high impact on availability with no compromise of confidentiality or integrity.", "risk_and_exploitability": "The CVSS score of 6.5 indicates a medium severity vulnerability, and the lack of an EPSS score or KEV listing implies there are currently no widespread exploit observations.\nHowever, the vulnerability can be triggered over any public or private network protocol supported by MySQL, meaning that any host exposed to the service is a potential target.\nAttackers require only network access and a basic credential or even anonymous connection depending on the configuration, making the threat realistic in many environments."}}}}, "created": "2026-04-22T02:30:05.615077+00:00", "title": "Denial of Service via Malformed JSON in MySQL Server", "updated": "2026-04-22T08:30:12.487577+00:00", "vendors": ["oracle", "oracle$PRODUCT$mysql_server"], "weaknesses": ["CWE-400", "CWE-770"]}