CVE-2026-34303: 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. in Oracle Corporation MySQL Server
CVE-2026-34303 is a vulnerability in Oracle MySQL Server affecting versions 8. 0. 0 through 8. 0. 45, 8. 4. 0 through 8. 4. 8, and 9. 0.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-34303) exists in the optimizer component of Oracle MySQL Server. It is easily exploitable by an attacker with low privileges and network access, potentially causing the server to hang or crash repeatedly, leading to a complete denial of service. The affected versions span multiple major releases of MySQL Server, including 8.0.x, 8.4.x, and 9.x series. The CVSS 3.1 base score is 6.5, reflecting a medium severity with an impact on availability only (no confidentiality or integrity impact). Oracle has addressed this vulnerability in its April 2026 Critical Patch Update, which includes security patches for MySQL Server and related products. Users should consult the Oracle advisory for patch availability and installation instructions.
Potential Impact
Successful exploitation of this vulnerability allows an attacker with low privileges and network access to cause a hang or frequent crash of the MySQL Server, resulting in denial of service. There is no impact on confidentiality or integrity. This can disrupt database availability and affect dependent applications or services.
Mitigation Recommendations
Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update. Customers should promptly apply the relevant patches for their MySQL Server versions (8.0.0-8.0.45, 8.4.0-8.4.8, 9.0.0-9.6.0) as documented in the Oracle advisory (https://www.oracle.com/security-alerts/cpuapr2026.html). No alternative mitigation or workaround is specified. Staying current with Oracle's Critical Patch Updates is strongly recommended to prevent exploitation.
CVE-2026-34303: 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. in Oracle Corporation MySQL Server
Description
CVE-2026-34303 is a vulnerability in Oracle MySQL Server affecting versions 8. 0. 0 through 8. 0. 45, 8. 4. 0 through 8. 4. 8, and 9. 0.
CVSS v3.1
Score 6.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-34303) exists in the optimizer component of Oracle MySQL Server. It is easily exploitable by an attacker with low privileges and network access, potentially causing the server to hang or crash repeatedly, leading to a complete denial of service. The affected versions span multiple major releases of MySQL Server, including 8.0.x, 8.4.x, and 9.x series. The CVSS 3.1 base score is 6.5, reflecting a medium severity with an impact on availability only (no confidentiality or integrity impact). Oracle has addressed this vulnerability in its April 2026 Critical Patch Update, which includes security patches for MySQL Server and related products. Users should consult the Oracle advisory for patch availability and installation instructions.
Potential Impact
Successful exploitation of this vulnerability allows an attacker with low privileges and network access to cause a hang or frequent crash of the MySQL Server, resulting in denial of service. There is no impact on confidentiality or integrity. This can disrupt database availability and affect dependent applications or services.
Mitigation Recommendations
Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update. Customers should promptly apply the relevant patches for their MySQL Server versions (8.0.0-8.0.45, 8.4.0-8.4.8, 9.0.0-9.6.0) as documented in the Oracle advisory (https://www.oracle.com/security-alerts/cpuapr2026.html). No alternative mitigation or workaround is specified. Staying current with Oracle's Critical Patch Updates is strongly recommended to prevent exploitation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- oracle
- Date Reserved
- 2026-03-26T19:48:45.678Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.oracle.com/security-alerts/cpuapr2026.html","vendor":"Oracle"}]
Threat ID: 69e7e5a819fe3cd2cdf9f9a6
Added to database: 4/21/2026, 9:01:28 PM
Last enriched: 4/29/2026, 11:39:58 AM
Last updated: 6/5/2026, 9:35:06 AM
Views: 65
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