CVE-2026-85748: MariaDB server is a community developed fork of MySQL server

This month

CRITICAL 9.9WATCHLISTUPGRADE

CVE-2026-85748 is a critical-severity flaw (CVSS 9.9) 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. From 12.3.1 until 12.3.3 and 13.0.2, SYS_REFCURSOR handling is affected because cursor-array reallocation can leave stale references in routine contexts. A low-privileged attacker can open a large number of SYS_REFCURSORs and then fetch one to trigger a use-after-free that can enable remote code execution when combined with another vulnerability. This issue is fixed in versions 12.3.3

Why this priority

Critical severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-10-16
Last modified	2026-10-20

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

Last updated 2026-10-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-16 17:17 UTCPublished CVE record published
2026-10-20 15:32 UTCUpdated Record last modified

mariadb mariadb UPGRADE

Affected: >= 12.3.1 and < 12.3.3 · 13.0.1

Fixed in: 12.3.3

Safe to downgrade to: a release before 12.3.1

1. Check installed version

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

2. UPGRADE to 12.3.3 (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 12.3.1 (Debian / Ubuntu)

apt-cache madison mariadb sudo apt install mariadb=<VERSION_BEFORE_12.3.1> 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_12.3.1> 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 ELN · edk2 · FIXED · 20260812-12.eln159 · FEDORA-2026-e316b6370a · source

sudo dnf upgrade --advisory=FEDORA-2026-e316b6370a

Fedora 46 · perl-Mojo-DOM58 · FIXED · 3.003-1.fc46 · FEDORA-2026-d5412af3de · source

sudo dnf upgrade --advisory=FEDORA-2026-d5412af3de

Debian 12 · mariadb · NOT AFFECTED

Debian 13 · mariadb · NOT AFFECTED

RHEL 10 · mariadb10.11 · NOT AFFECTED

RHEL 10 · mariadb11.8 · NOT AFFECTED

RHEL 7 · mariadb · NOT AFFECTED

RHEL 8 · mariadb:10.11/mariadb · NOT AFFECTED

RHEL 8 · mariadb:10.3/mariadb · NOT AFFECTED

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-2026-85748?

mariadb: upgrade to 12.3.3. Exact commands for each OS are on this page.

Is CVE-2026-85748 being exploited?

CVE-2026-85748 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-2026-85748 affect?

CVE-2026-85748 affects mariadb. Severity is critical (CVSS 9.9). MariaDB server is a community developed fork of MySQL server. From 12.3.1 until 12.3.3 and 13.0.2, SYS_REFCURSOR handling is affected because cursor-array reallocation can leave stale references in routine contexts. A low-privileged attacke

How urgent is CVE-2026-85748?

Priority 55/100. Critical severity; On your watchlist

Software pages

MySQL vulnerabilities · MariaDB vulnerabilities

Related CVEs

CVE-2026-49261 CRITICAL 10.0 UPGRADE MariaDB server is a community developed fork of MySQL server
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

References

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