CVE-2026-49261: MariaDB server is a community developed fork of MySQL server

This week

CRITICAL 10.0REMOTEWATCHLISTUPGRADE

CVE-2026-49261 is a critical-severity flaw (CVSS 10.0) affecting mariadb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MariaDB server is a community developed fork of MySQL server. Versions 10.6.1 through 10.6.26, 10.11.1 through 10.11.17, 11.4.1 through 11.4.11, 11.8.1 through 11.8.7, and 12.3.1 with `wsrep_notify_cmd` enabled would execute shell commands embedded in the name of the joiner node. This is fixed in 10.6.27, 10.11.18, 11.4.12, 11.8.8, and 12.3.2. As a workaround, anyone who cannot upgrade now should disable `wsrep_notify_cmd`.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-06-11
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: mariadb

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

Am I affected?

Timeline

2026-06-11 18:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

mariadb mariadb UPGRADE

Affected: >= 10.6.1 and < 10.6.27 · >= 10.11.1 and < 10.11.18 · >= 11.4.1 and < 11.4.12 · >= 11.8.1 and < 11.8.8 · 12.3.1

Fixed in: 10.6.27, 10.11.18, 11.4.12, 11.8.8

Safe to downgrade to: a release before 10.6.1

1. Check installed version

apt-cache policy mariadb || rpm -q mariadb || mariadb --version

2. UPGRADE to 10.6.27 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mariadb

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mariadb

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 10.6.1 (Debian / Ubuntu)

apt-cache madison mariadb sudo apt install mariadb=<VERSION_BEFORE_10.6.1> sudo apt-mark hold mariadb

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

dnf --showduplicates list mariadb sudo dnf downgrade mariadb-<VERSION_BEFORE_10.6.1> sudo dnf versionlock add mariadb

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.

Exact fixes by distribution

Fedora 46 · flare-im · FIXED · 0.22.7-1.fc46 · FEDORA-2026-cd5e8062a1 · source

sudo dnf upgrade --advisory=FEDORA-2026-cd5e8062a1

Fedora ELN · libdnf · FIXED · 0.76.0-2.eln159 · FEDORA-2026-dbd263e9d4 · source

sudo dnf upgrade --advisory=FEDORA-2026-dbd263e9d4

Debian 12 · mariadb · FIXED · 1:10.11.18-0+deb12u1

sudo apt update && sudo apt install --only-upgrade mariadb dpkg --compare-versions "$(dpkg-query -W -f='${Version}' mariadb)" ge "1:10.11.18-0+deb12u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · mariadb · NO FIX YET

RHEL 10 · mariadb10.11 · FIXED · mariadb10.11-10.11.18-1.el10_2

sudo dnf upgrade --advisory=RHSA-2026:33093 rpm -q mariadb10.11

RHEL 10 · mariadb11.8 · FIXED · mariadb11.8-11.8.8-1.el10_2

sudo dnf upgrade --advisory=RHSA-2026:33412 rpm -q mariadb11.8

RHEL 10.0 Extended Update Support · mariadb10.11 · FIXED · mariadb10.11-10.11.18-1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:49522 rpm -q mariadb10.11

RHEL 7 · mariadb · NOT AFFECTED

RHEL 9 · mariadb · NOT AFFECTED

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:33481] Important: mariadb:11.8 security, bug fix, and enhancement update 2026-07-02

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-2026-49261?

mariadb: upgrade to 10.6.27, 10.11.18, 11.4.12, 11.8.8. Exact commands for each OS are on this page.

Is CVE-2026-49261 being exploited?

CVE-2026-49261 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-2026-49261 affect?

CVE-2026-49261 affects mariadb. Severity is critical (CVSS 10.0). MariaDB server is a community developed fork of MySQL server. Versions 10.6.1 through 10.6.26, 10.11.1 through 10.11.17, 11.4.1 through 11.4.11, 11.8.1 through 11.8.7, and 12.3.1 with `wsrep_notify_cmd` enabled would execute shell commands

How urgent is CVE-2026-49261?

Priority 67/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

MySQL vulnerabilities · MariaDB vulnerabilities

Related CVEs

CVE-2026-44170 CRITICAL 9.8 UPGRADE MariaDB server is a community developed fork of MySQL server
CVE-2026-44172 CRITICAL 9.1 DOWNGRADE MITIGATE MariaDB server is a community developed fork of MySQL server
CVE-2026-48165 HIGH 8.0 UPGRADE MariaDB server is a community developed fork of MySQL server
CVE-2026-48163 HIGH 8.0 UPGRADE MariaDB server is a community developed fork of MySQL server
CVE-2026-44168 HIGH 8.0 UPGRADE MariaDB server is a community developed fork of MySQL server

References

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