CVE-2026-34271: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin)

Routine

MEDIUM 6.5WATCHLISTUPGRADE

CVE-2026-34271 is a medium-severity flaw (CVSS 6.5) affecting mysql server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low 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

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-400
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 21:16 UTCPublished CVE record published
2026-10-26 00:10 UTCUpdated Record last modified

oracle mysql server UPGRADE

Affected: >= 8.0.0 and <= 8.0.45 · >= 8.4.0 and <= 8.4.8 · >= 9.0.0 and <= 9.6.0

Fixed in: newer than 9.6.0

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy mysql-server || rpm -q mysql-server || mysql-server --version

2. UPGRADE to newer than 9.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mysql-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mysql-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison mysql-server sudo apt install mysql-server=<VERSION_BEFORE_8.0.0> sudo apt-mark hold mysql-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mysql-server sudo dnf downgrade mysql-server-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add mysql-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34271?

mysql server: upgrade to newer than 9.6.0. Exact commands for each OS are on this page.

Is CVE-2026-34271 being exploited?

CVE-2026-34271 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34271 affect?

CVE-2026-34271 affects mysql server. Severity is medium (CVSS 6.5). Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privi

How urgent is CVE-2026-34271?

Priority 33/100. On your watchlist

Software pages

MySQL vulnerabilities

Related CVEs

CVE-2026-22009 MEDIUM 6.5 UPGRADE Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer)
CVE-2026-34270 MEDIUM 6.5 UPGRADE Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin)
CVE-2026-35238 MEDIUM 4.9 UPGRADE Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB)
CVE-2026-47023 MEDIUM 4.9 UPGRADE UPGRADE Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Replication)
CVE-2026-60190 LOW 2.2 UPGRADE UPGRADE Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Replication)

References

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