CVE-2026-34278: Easily exploitable vulnerability allows high 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
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45. Easily exploitable vulnerability allows high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
AI Analysis
Technical Summary
This vulnerability in Oracle MySQL Server (versions 8.0.0 to 8.0.45) affects the Server Optimizer component and permits a high-privileged attacker with network access to cause a hang or repeated crash, resulting in a denial of service. The CVSS 3.1 base score is 4.9, reflecting a medium severity with an impact limited to availability. The vulnerability is addressed in Oracle's April 2026 Critical Patch Update, which contains patches for MySQL Server among other products. Oracle strongly recommends applying these patches promptly to prevent exploitation.
Potential Impact
Successful exploitation allows a high-privileged attacker with network access to cause MySQL Server to hang or crash repeatedly, resulting in a complete denial of service. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update. Users should apply the April 2026 Critical Patch Update for MySQL Server versions 8.0.0 through 8.0.45 to remediate this issue. Oracle strongly recommends staying on actively supported versions and applying security patches without delay. Patch status is confirmed by the vendor advisory.
CVE-2026-34278: Easily exploitable vulnerability allows high 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
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45. Easily exploitable vulnerability allows high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Oracle MySQL Server (versions 8.0.0 to 8.0.45) affects the Server Optimizer component and permits a high-privileged attacker with network access to cause a hang or repeated crash, resulting in a denial of service. The CVSS 3.1 base score is 4.9, reflecting a medium severity with an impact limited to availability. The vulnerability is addressed in Oracle's April 2026 Critical Patch Update, which contains patches for MySQL Server among other products. Oracle strongly recommends applying these patches promptly to prevent exploitation.
Potential Impact
Successful exploitation allows a high-privileged attacker with network access to cause MySQL Server to hang or crash repeatedly, resulting in a complete denial of service. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update. Users should apply the April 2026 Critical Patch Update for MySQL Server versions 8.0.0 through 8.0.45 to remediate this issue. Oracle strongly recommends staying on actively supported versions and applying security patches without delay. Patch status is confirmed by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- oracle
- Date Reserved
- 2026-03-26T19:48:45.675Z
- 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: 69e7e5a219fe3cd2cdf9f7c0
Added to database: 4/21/2026, 9:01:22 PM
Last enriched: 4/21/2026, 10:03:01 PM
Last updated: 4/22/2026, 6:09:20 AM
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.