CVE-2026-34318Network attack vector

Authenticated data disclosure via undisclosed Core Client flaw

Published Apr 21, 2026 · Updated Apr 21, 2026

Information disclosure in Oracle MySQL Shell allows remote authenticated users to read critical data over multiple protocols. Oracle identifies the locus only as Shell: Core Client and has not published the operation that mishandles untrusted input. Exploitation requires high privileges and difficult network access; success exposes critical or all Shell-accessible data without reported modification or service interruption.

CVSS severity5.8
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Oracle MySQL Shell allows remote authenticated users to read critical data over multiple protocols. Oracle identifies the locus only as Shell: Core Client and has not published the operation that mishandles untrusted input. Exploitation requires high privileges and difficult network access; success exposes critical or all Shell-accessible data without reported modification or service interruption.

The record

CVE
CVE-2026-34318
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Oracle
Product
MySQL Shell
Classifications
CWE-200
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 · MySQL Shellversion=8.0.0 <=8.0.45; version=8.4.0 <=8.4.8; version=9.0.0 <=9.6.0

Published CVSS scores

5.8OracleCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N

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-200Exposure of Sensitive Information to an Unauthorized Actor

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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