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Vulnerability · Published Apr 7, 2026 · Assigned by Go

CVE-2026-33816CVE-2026-33816 in github.com/jackc/pgx

Critical 9.8

In plain English

A critical-severity out-of-bounds write in github.com/jackc/pgx/v5/pgproto3 from github.com/jackc/pgx/v5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 52.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Memory-safety vulnerability in github.com/jackc/pgx/v5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10go-fdo-server1.0.1-1.el10_2ALSA-2026:19137
AlmaLinux:10go-fdo-server-manufacturer1.0.1-1.el10_2ALSA-2026:19137
AlmaLinux:10go-fdo-server-owner1.0.1-1.el10_2ALSA-2026:19137
AlmaLinux:10go-fdo-server-rendezvous1.0.1-1.el10_2ALSA-2026:19137
Debian:14golang-github-jackc-pgx-v55.9.2-1DEBIAN-CVE-2026-33816
Gogithub.com/jackc/pgx/v55.9.0GHSA-9jj7-4m8r-rfcm
Gogithub.com/jackc/pgx/v55.9.0GO-2026-4772
Rocky Linux:10go-fdo-server0:1.0.1-1.el10_2RLSA-2026:19137
Ubuntu:26.04:LTSgolang-github-jackc-pgx-v5no fix listedUBUNTU-CVE-2026-33816
Ubuntu:26.10golang-github-jackc-pgx-v5no fix listedUBUNTU-CVE-2026-33816

Affected products (as reported)

VendorProductVersions
github.com/jackc/pgx/v5 github.com/jackc/pgx/v5/pgproto3 0 – before 5.9.0

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References