CVE-2026-34267: 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-2026-34267 is a 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 hang or repeated crash of the MySQL Server, resulting in a denial of service (DoS). The vulnerability has a CVSS 3. 1 base score of 4. 9, indicating a medium severity focused on availability impact. Oracle has included this vulnerability in its April 2026 Critical Patch Update, which provides security patches addressing this and other vulnerabilities.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-34267) affects Oracle MySQL Server versions 8.0.0 to 8.0.45 in the Server Optimizer component. It permits a high privileged attacker with network access to cause a denial of service by hanging or repeatedly crashing the MySQL Server. The CVSS 3.1 vector indicates network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high availability impact. Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update, which covers multiple Oracle products including MySQL Server. The advisory strongly recommends applying these patches promptly to mitigate the risk.
Potential Impact
Successful exploitation allows an attacker with high privileges and network access to cause a complete denial of service by hanging or crashing the MySQL Server. There is no impact on confidentiality or integrity, only availability is affected. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Oracle has released security patches for this vulnerability in the April 2026 Critical Patch Update. Users running affected versions of MySQL Server (8.0.0 through 8.0.45) should apply the April 2026 Critical Patch Update without delay to remediate this vulnerability. No other mitigation or workaround is indicated by the vendor advisory.
CVE-2026-34267: 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-2026-34267 is a 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 hang or repeated crash of the MySQL Server, resulting in a denial of service (DoS). The vulnerability has a CVSS 3. 1 base score of 4. 9, indicating a medium severity focused on availability impact. Oracle has included this vulnerability in its April 2026 Critical Patch Update, which provides security patches addressing this and other vulnerabilities.
CVSS v3.1
Score 4.9medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-34267) affects Oracle MySQL Server versions 8.0.0 to 8.0.45 in the Server Optimizer component. It permits a high privileged attacker with network access to cause a denial of service by hanging or repeatedly crashing the MySQL Server. The CVSS 3.1 vector indicates network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high availability impact. Oracle has released patches for this vulnerability as part of the April 2026 Critical Patch Update, which covers multiple Oracle products including MySQL Server. The advisory strongly recommends applying these patches promptly to mitigate the risk.
Potential Impact
Successful exploitation allows an attacker with high privileges and network access to cause a complete denial of service by hanging or crashing the MySQL Server. There is no impact on confidentiality or integrity, only availability is affected. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Oracle has released security patches for this vulnerability in the April 2026 Critical Patch Update. Users running affected versions of MySQL Server (8.0.0 through 8.0.45) should apply the April 2026 Critical Patch Update without delay to remediate this vulnerability. No other mitigation or workaround is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- oracle
- Date Reserved
- 2026-03-26T19:48:45.674Z
- 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: 69e7e5a019fe3cd2cdf9f73c
Added to database: 4/21/2026, 9:01:20 PM
Last enriched: 4/29/2026, 11:33:45 AM
Last updated: 6/6/2026, 5:47:50 AM
Views: 51
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.