How do I check whether I am affected by CVE-2026-101780?

- Run `SELECT VERSION();` in MySQL and compare against the affected ranges: MySQL Server 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1; MySQL Cluster 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1. - Run `SHOW PLUGINS;` and check whether the X Plugin (mysqlx) is loaded.

What is the fix for CVE-2026-101780?

- Upgrade MySQL Server and MySQL Cluster to a release outside the affected ranges, as published in Oracle's advisory (the sources do not name the fixed version). - Until patched, disable the X Plugin if it is not needed, or restrict network access to the MySQL X protocol port.

Who is not affected by CVE-2026-101780?

Not affected if: network-restricted, x-plugin-disabled.

Live › vulnerability › CVE-2026-101780

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medium6.5Package

MySQL Server X Plugin flaw lets low-privilege users crash the server

A flaw in the X Plugin component of MySQL Server and MySQL Cluster lets an authenticated low-privilege user over the network cause a hang or repeatable crash. The impact is denial of service only; the sources report no confidentiality or integrity loss.

Summary written from the sources below. Check the originals before acting.

CVSS 3.x

6.5

medium

scored by [email protected]

known so far3 of 6

missing: versions, primary source, exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 22, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is medium, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Yes.
Needs a special setup: Not known from the sources.
Reachable from: network.
Worst case: Repeatable server crash or hang causing full denial of service.
CVSS said: 6.5. The facts above say low; we keep the sources' medium until an analyst looks.

Who is affected

Teams running MySQL Server or MySQL Cluster in the affected version ranges with the X Plugin (X Protocol, port 33060 by default) reachable by clients. Systems on older 8.0 or 8.4 patch levels outside the listed ranges, or with the X Plugin disabled and not reachable, are less exposed. The sources do not say which default configuration ships the plugin enabled.

Know the next one before it finds you.

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Live › vulnerability › CVE-2026-101780

Go to dashboard

medium6.5Package

MySQL Server X Plugin flaw lets low-privilege users crash the server

Summary written from the sources below. Check the originals before acting.

CVSS 3.x

6.5

medium

scored by [email protected]

known so far3 of 6

missing: versions, primary source, exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 22, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is medium, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Yes.
Needs a special setup: Not known from the sources.
Reachable from: network.
Worst case: Repeatable server crash or hang causing full denial of service.
CVSS said: 6.5. The facts above say low; we keep the sources' medium until an analyst looks.

Who is affected

Know the next one before it finds you.

Add to Slack

MySQL Server X Plugin flaw lets low-privilege users crash the server

Why it is medium, and not just CVSS

Who is affected

Know the next one before it finds you.

MySQL Server X Plugin flaw lets low-privilege users crash the server

Why it is medium, and not just CVSS

Who is affected

Know the next one before it finds you.

How to check

The fix

Who had it, and when

What the sources say, verbatim

Sources