CVE-2026-32286: The DataRow.Decode function fails to properly validate field lengths

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HIGH 7.5REMOTEUPGRADE

CVE-2026-32286 is a high-severity flaw (CVSS 7.5) affecting pgproto3. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The DataRow.Decode function fails to properly validate field lengths. A malicious or compromised PostgreSQL server can send a DataRow message with a negative field length, causing a slice bounds out of range panic.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
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-129, CWE-1285
Published	2026-03-26
Last modified	2026-09-10

Publisher (CNA): Go Project · Vendor: jackc

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 20:16 UTCPublished CVE record published
2026-09-10 13:18 UTCUpdated Record last modified

jackc pgproto3 UPGRADE

Affected: >= 2.0.0 and <= 2.3.3

Fixed in: newer than 2.3.3

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy pgproto3 || rpm -q pgproto3 || pgproto3 --version

2. UPGRADE to newer than 2.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pgproto3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pgproto3

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 2.0.0 (Debian / Ubuntu)

apt-cache madison pgproto3 sudo apt install pgproto3=<VERSION_BEFORE_2.0.0> sudo apt-mark hold pgproto3

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

dnf --showduplicates list pgproto3 sudo dnf downgrade pgproto3-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add pgproto3

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-2026-32286?

pgproto3: upgrade to newer than 2.3.3. Exact commands for each OS are on this page.

Is CVE-2026-32286 being exploited?

CVE-2026-32286 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-2026-32286 affect?

CVE-2026-32286 affects pgproto3. Severity is high (CVSS 7.5). The DataRow.Decode function fails to properly validate field lengths. A malicious or compromised PostgreSQL server can send a DataRow message with a negative field length, causing a slice bounds out of range panic.

How urgent is CVE-2026-32286?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Software pages

PostgreSQL vulnerabilities

References

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