CVE-2026-48773: ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL

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CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-48773 is a critical-severity flaw (CVSS 9.8) affecting proxysql. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Versions 2.0.18 through 3.0.8 have a pre-authentication heap memory corruption vulnerability in the MySQL and PostgreSQL protocol first-read paths. A remote unauthenticated client can declare an oversized first packet length, and ProxySQL passes that attacker-controlled length directly to `recv()` while writing into a fixed 32 KB input queue. Version 3.0.9 patches the issue.

Why this priority

Critical severity
Public exploit reference
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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-06-19
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 20:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

proxysql proxysql UPGRADE

Affected: >= 2.0.18 and < 3.0.9

Fixed in: 3.0.9

Safe to downgrade to: a release before 2.0.18

1. Check installed version

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

2. UPGRADE to 3.0.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade proxysql

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 2.0.18 (Debian / Ubuntu)

apt-cache madison proxysql sudo apt install proxysql=<VERSION_BEFORE_2.0.18> sudo apt-mark hold proxysql

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

dnf --showduplicates list proxysql sudo dnf downgrade proxysql-<VERSION_BEFORE_2.0.18> sudo dnf versionlock add proxysql

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 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/sysown/proxysql/security/advisories/GHSA-58ww-865x-grpr

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-2026-48773?

proxysql: upgrade to 3.0.9. Exact commands for each OS are on this page.

Is CVE-2026-48773 being exploited?

CVE-2026-48773 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-2026-48773 affect?

CVE-2026-48773 affects proxysql. Severity is critical (CVSS 9.8). ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Versions 2.0.18 through 3.0.8 have a pre-authentication heap memory corruption vulnerability in the MySQL and PostgreSQL protocol first-read paths. A remote unauthenticated

How urgent is CVE-2026-48773?

Priority 65/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

MySQL vulnerabilities · PostgreSQL vulnerabilities

Related CVEs

CVE-2026-48772 CRITICAL 10.0 UPGRADE ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL
CVE-2026-48774 HIGH 7.5 UPGRADE ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL

References

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