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Fencer Intel
medium 6.5

CVE-2026-34271 json

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin).

published 6mo ago modified 14d ago also EUVD-2026-24346

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

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 (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Patch / fix

  • oracle mysql 8.0.46, 8.4.9, 9.7.0
  • oracle mysql_server 8.0.46, 8.4.9, 9.7.0
  • mysql-8.0 Ubuntu 22.04 LTS 8.0.46-0ubuntu0.22.04.2
  • mysql-8.0 Ubuntu 24.04 LTS 8.0.46-0ubuntu0.24.04.2
  • mysql-8.4 Ubuntu 25.10 8.4.9-0ubuntu0.25.10.1
  • mysql-8.4 Ubuntu 26.04 LTS 8.4.9-0ubuntu0.26.04.1
  • mysql-8.0 Ubuntu Pro 20.04 LTS 8.0.46-0ubuntu0.20.04.1+esm2

ubuntu advisories UBUNTU-CVE-2026-34271

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mecab RHEL 8 0.996-2.module+el8.10.0+23550+bd321b9a
  • mysql RHEL 8 8.4.9-1.module+el8.10.0+24336+5a933ab6
  • mysql-libs RHEL 8 8.4.9-1.module+el8.10.0+24336+5a933ab6
  • mysql-test RHEL 8 8.4.9-1.module+el8.10.0+24336+5a933ab6
  • mecab-ipadic RHEL 8 2.7.0.20070801-17.module+el8.10.0+23550+bd321b9a
  • mysql-common RHEL 8 8.4.9-1.module+el8.10.0+24336+5a933ab6
  • mysql-errmsg RHEL 8 8.4.9-1.module+el8.10.0+24336+5a933ab6
  • mysql-server RHEL 8 8.4.9-1.module+el8.10.0+24336+5a933ab6

red hat advisories RHSA-2026:26180RHSA-2026:25919RHSA-2026:25052RHSA-2026:23332RHSA-2026:20693

  • mecab AlmaLinux 8 0.996-2.module_el8.10.0+4060+d4256e26
  • mysql AlmaLinux 8 8.4.9-1.module_el8.10.0+4193+cbb8e728
  • mysql-libs AlmaLinux 8 8.4.9-1.module_el8.10.0+4193+cbb8e728
  • mysql-test AlmaLinux 8 8.4.9-1.module_el8.10.0+4193+cbb8e728
  • mecab-ipadic AlmaLinux 8 2.7.0.20070801-17.module_el8.10.0+4060+d4256e26
  • mecab-ipadic AlmaLinux 8 2.7.0.20070801-17.module_el8.10.0+4154+a69a9128
  • mysql-common AlmaLinux 8 8.4.9-1.module_el8.10.0+4193+cbb8e728
  • mysql-errmsg AlmaLinux 8 8.4.9-1.module_el8.10.0+4193+cbb8e728

almalinux advisories ALSA-2026:26180ALSA-2026:25919ALSA-2026:25052ALSA-2026:23332ALSA-2026:20693

  • mecab Rocky Linux 8 0.996-2.module+el8.10.0+1676+9b4b6e24
  • mecab Rocky Linux 8 0.996-2.module+el8.10.0+1937+28fbbc83
  • mecab Rocky Linux 8 0.996-2.module+el8.10.0+2091+db4d14f6
  • mecab-ipadic Rocky Linux 8 2.7.0.20070801-17.module+el8.10.0+1937+28fbbc83
  • mecab-ipadic Rocky Linux 8 2.7.0.20070801-17.module+el8.10.0+2091+db4d14f6
  • mysql Rocky Linux 9 8.0.46-1.el9_8.rocky.0.1
  • mecab Rocky Linux 9 0.996-3.module+el9.8.0+40162+a76274f1.4
  • rapidjson Rocky Linux 9 1.1.0-19.module+el9.8.0+40162+a76274f1

rocky linux advisories RLSA-2026:26180RLSA-2026:25919RLSA-2026:23332RLSA-2026:25052RLSA-2026:20693

  • mysql Azure Linux 3.0 8.0.46-1

azure linux advisories AZL-83136

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-34271 updated cvss 6.5

mysql: Group Replication Plugin unspecified vulnerability (CPU Apr 2026)

  • Red Hat Enterprise Linux AppStream (v. 8) mecab 0.996-2.module+el8.10.0+22857+7f331edd, mecab 0.996-2.module+el8.10.0+23550+bd321b9a, mysql 8.4.9-1.module+el8.10.0+24336+5a933ab6, mysql 8.0.46-1.module+el8.10.0+24370+d5a391f0, mysql-libs 8.4.9-1.module+el8.10.0+24336+5a933ab6, mysql-test 8.4.9-1.module+el8.10.0+24336+5a933ab6, +13 more
    fixed: vendor fix RHSA-2026:25919
  • Red Hat Enterprise Linux AppStream (v. 9) mysql 8.0.46-1.el9_8, mysql-libs 8.0.46-1.el9_8, mysql-common 8.0.46-1.el9_8, mysql-errmsg 8.0.46-1.el9_8, mysql-server 8.0.46-1.el9_8, mysql 8.4.9-1.module+el9.8.0+24348+9b27f387, +11 more
    fixed: vendor fix RHSA-2026:25052
  • Red Hat Enterprise Linux AppStream (v. 10) mysql8.4 8.4.9-1.el10_2, mysql8.4-libs 8.4.9-1.el10_2, mysql8.4-common 8.4.9-1.el10_2, mysql8.4-errmsg 8.4.9-1.el10_2, mysql8.4-server 8.4.9-1.el10_2
    fixed: vendor fix RHSA-2026:20693
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) mysql-test 8.0.46-1.el9_8
    fixed: vendor fix RHSA-2026:23332
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) mysql8.4-test 8.4.9-1.el10_2, mysql8.4-test-data 8.4.9-1.el10_2
    fixed: vendor fix RHSA-2026:20693
  • Red Hat Enterprise Linux 6 mysql, mysql-libs, mysql-test, mysql-bench, mysql-server, mysql-embedded
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Oracle Corporation MySQL Server

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.