CVE-2026-21998Network attack vector

Authenticated database service hang or crash

Published Apr 21, 2026 · Updated Apr 21, 2026

Denial of service in Oracle MySQL Server's Optimizer allows remote authenticated users to hang or repeatedly crash affected servers. Oracle has not disclosed the Optimizer operation or malformed input that consumes resources, so the precise trigger is not public. Exploitation requires a high-privilege database account and network access through a supported protocol; affected releases are 8.0.0 through 8.0.45, 8.4.0 through 8.4.8, and 9.0.0 through 9.6.0.

CVSS severity4.9
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Oracle MySQL Server's Optimizer allows remote authenticated users to hang or repeatedly crash affected servers. Oracle has not disclosed the Optimizer operation or malformed input that consumes resources, so the precise trigger is not public. Exploitation requires a high-privilege database account and network access through a supported protocol; affected releases are 8.0.0 through 8.0.45, 8.4.0 through 8.4.8, and 9.0.0 through 9.6.0.

The record

CVE
CVE-2026-21998
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Oracle Corporation
Product
MySQL Server
Classifications
CWE-400, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.0.0 <=8.0.45
  2. Affected versionversion=8.4.0 <=8.4.8
  3. Affected versionversion=9.0.0 <=9.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Oracle Corporation · MySQL Serverversion=8.0.0 <=8.0.45; version=8.4.0 <=8.4.8; version=9.0.0 <=9.6.0

Published CVSS scores

4.9Oracle CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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