CVE-2026-6476: SQL injection in PostgreSQL pg_createsubscriber allows an attacker with pg_create_subscription rights to execu

Routine

HIGH 7.2UPGRADE

CVE-2026-6476 is a high-severity flaw (CVSS 7.2) affecting postgresql. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SQL injection in PostgreSQL pg_createsubscriber allows an attacker with pg_create_subscription rights to execute arbitrary SQL as a superuser. The attack takes effect when pg_createsubscriber next runs. Within major versions 17 and 18, minor versions before PostgreSQL 18.4 and 17.10 are affected. Versions before PostgreSQL 17 are unaffected.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-89
Published	2026-05-14
Last modified	2026-06-17

Publisher (CNA): PostgreSQL · Vendor: postgresql

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-14 14:16 UTCPublished CVE record published
2026-06-17 11:00 UTCUpdated Record last modified

postgresql postgresql UPGRADE

Affected: >= 17.0 and < 17.10 · >= 18.0 and < 18.4

Fixed in: 17.10, 18.4

Safe to downgrade to: a release before 17.0

1. Check installed version

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

2. UPGRADE to 17.10 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade postgresql

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 17.0 (Debian / Ubuntu)

apt-cache madison postgresql sudo apt install postgresql=<VERSION_BEFORE_17.0> sudo apt-mark hold postgresql

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

dnf --showduplicates list postgresql sudo dnf downgrade postgresql-<VERSION_BEFORE_17.0> sudo dnf versionlock add postgresql

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-2026-6476?

postgresql: upgrade to 17.10, 18.4. Exact commands for each OS are on this page.

Is CVE-2026-6476 being exploited?

CVE-2026-6476 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-2026-6476 affect?

CVE-2026-6476 affects postgresql. Severity is high (CVSS 7.2). SQL injection in PostgreSQL pg_createsubscriber allows an attacker with pg_create_subscription rights to execute arbitrary SQL as a superuser. The attack takes effect when pg_createsubscriber next runs. Within major versions 17 and 18, mi

How urgent is CVE-2026-6476?

Priority 30/100. High severity

Software pages

PostgreSQL vulnerabilities

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References

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