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Critical· 9.8

CVE-2026-33816

CVE-2026-33816 is a critical memory-safety flaw in the github.com/jackc/pgx/v5 library, a PostgreSQL driver for Go. It can be exploited over a network without authentication and may allow an attacker to read, modify, or disrupt data and services.

publishedApr 7, 2026
last modifiedAug 3, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
44th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Sep 1, 2026

No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.

01

Who is affected

Applications and services written in Go that use the github.com/jackc/pgx/v5 package to connect to PostgreSQL are affected.

02

Real-world impact

A remote, unauthenticated attacker could exploit this out-of-bounds write (CWE-787) to compromise the confidentiality, integrity, and availability of systems using the affected pgx library. Given the critical CVSS score of 9.8, successful exploitation could lead to full loss of protection for affected data and services.

03

Why this severity

Critical (CVSS 9.8) means the flaw is easy to exploit remotely without privileges or user interaction and can cause severe damage. Treat it as urgent even though no public exploit or active exploitation is recorded yet.

04

What to do about it

no official fix yet
interim mitigations
  • ›No official patch or upgrade is documented in the provided sources. Monitor the vendor (jackc/pgx) and NVD for a released fix, and limit network exposure of any services using github.com/jackc/pgx/v5 until a fix is available.

No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.

No fix documented in sources

05

Timeline

  1. Apr 7, 2026 · Apr 7, 2026
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Aug 3, 2026 · 2d ago
    Advisory updated
    The NVD record was last revised.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
CVE-2026-33816: CVE-2026-33816 is a critical memory-safety flaw in the github.com/jack · Vulnary