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
CVE-2026-34278 is a medium severity vulnerability in Oracle MySQL Server versions 8. 0. 0 through 8. 0. 45 affecting the Server Optimizer component. It allows a high privileged attacker with network access via multiple protocols to cause a denial of service by hanging or repeatedly crashing the MySQL Server. The vulnerability impacts availability but does not affect confidentiality or integrity. Oracle has included this vulnerability in its April 2026 Critical Patch Update advisory, which provides cumulative patches addressing this and other vulnerabilities. Users are strongly advised to apply the April 2026 Critical Patch Update to remediate this issue.
AI Analysis
Technical Summary
This vulnerability in Oracle MySQL Server (8.0.0-8.0.45) involves the Server Optimizer component and enables a high privileged attacker with network access to cause a denial of service by hanging or crashing the server repeatedly. The CVSS 3.1 base score is 4.9, reflecting an availability impact only, with no confidentiality or integrity impact. The vulnerability is categorized under CWE-400 (Uncontrolled Resource Consumption). Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update, which includes 481 security fixes across multiple products. The advisory strongly recommends applying these patches promptly to mitigate the risk.
Potential Impact
Successful exploitation results in denial of service conditions on MySQL Server, causing it to hang or crash repeatedly. This impacts availability but does not compromise confidentiality or integrity of data. The vulnerability requires high privileges and network access via multiple protocols. There are no known exploits in the wild at this time.
Mitigation Recommendations
Oracle has released patches for this vulnerability in the April 2026 Critical Patch Update. Users should apply the April 2026 CPU promptly to remediate this issue. Oracle strongly recommends staying on actively supported versions and applying all Critical Patch Updates without delay. Patch status is confirmed as available via the Oracle advisory: https://www.oracle.com/security-alerts/cpuapr2026.html
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
CVE-2026-34278 is a medium severity vulnerability in Oracle MySQL Server versions 8. 0. 0 through 8. 0. 45 affecting the Server Optimizer component. It allows a high privileged attacker with network access via multiple protocols to cause a denial of service by hanging or repeatedly crashing the MySQL Server. The vulnerability impacts availability but does not affect confidentiality or integrity. Oracle has included this vulnerability in its April 2026 Critical Patch Update advisory, which provides cumulative patches addressing this and other vulnerabilities. Users are strongly advised to apply the April 2026 Critical Patch Update to remediate this issue.
CVSS v3.1
Score 4.9medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Oracle MySQL Server (8.0.0-8.0.45) involves the Server Optimizer component and enables a high privileged attacker with network access to cause a denial of service by hanging or crashing the server repeatedly. The CVSS 3.1 base score is 4.9, reflecting an availability impact only, with no confidentiality or integrity impact. The vulnerability is categorized under CWE-400 (Uncontrolled Resource Consumption). Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update, which includes 481 security fixes across multiple products. The advisory strongly recommends applying these patches promptly to mitigate the risk.
Potential Impact
Successful exploitation results in denial of service conditions on MySQL Server, causing it to hang or crash repeatedly. This impacts availability but does not compromise confidentiality or integrity of data. The vulnerability requires high privileges and network access via multiple protocols. There are no known exploits in the wild at this time.
Mitigation Recommendations
Oracle has released patches for this vulnerability in the April 2026 Critical Patch Update. Users should apply the April 2026 CPU promptly to remediate this issue. Oracle strongly recommends staying on actively supported versions and applying all Critical Patch Updates without delay. Patch status is confirmed as available via the Oracle advisory: https://www.oracle.com/security-alerts/cpuapr2026.html
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: 4/29/2026, 11:27:53 AM
Last updated: 6/5/2026, 7:38:04 PM
Views: 47
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.