CVE-2026-33816: Github.com/jackc/pgx/v5 Memory-safety Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-9jj7-4m8r-rfcm
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CVSS 9.8
CWE-20
Published
Advisory Summary

CVE-2026-33816 is a CRITICAL (CVSS 9.8) memory-safety vulnerability vulnerability (CWE-20: Improper Input Validation) affecting Github.com/jackc/pgx/v5 libraries in the Go ecosystem. The issue involves memory-safety vulnerability in github.com/jackc/pgx/v5.. Remediation is available by upgrading affected packages to version 5.9.0.

CVE-2026-33816 at a Glance

CVE Identifier CVE-2026-33816
GHSA Identifier GHSA-9jj7-4m8r-rfcm
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-20: Improper Input Validation
Affected Product Github.com/jackc/pgx/v5
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-33816

To remediate this vulnerability, upgrade all affected Github.com/jackc/pgx/v5 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/jackc/pgx/v5 fixed: 5.9.0 
Upgrade github.com/jackc/pgx/v5 to 5.9.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/jackc/pgx/v5

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-33816, inspect your project dependencies for Github.com/jackc/pgx/v5:

inspect dependencies for github.com/jackc/pgx/v5

Analyze the terminal output to locate any version of Github.com/jackc/pgx/v5 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.9.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Github.com/jackc/pgx/v5, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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

CVE-2026-33816 Affected Github.com/jackc/pgx/v5 Versions

1 component(s)
Fixed Versions:
5.9.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/jackc/pgx/v5
golang/github.com/jackc/pgx/v5
Go
< 5.9.0
5.9.0

References

NVD — CVE-2026-33816 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33816
Github.com/jackc/pgx/v5 Source Repository REPOSITORY
https://github.com/jackc/pgx
pkg.go.dev/vuln/go-2026-4772 WEB
https://pkg.go.dev/vuln/GO-2026-4772

Frequently Asked Questions

What is CVE-2026-33816?
CVE-2026-33816 is a security vulnerability in Github.com/jackc/pgx/v5 involving Memory-safety vulnerability in github.com/jackc/pgx/v5. under CWE-20: Improper Input Validation.
Which Github.com/jackc/pgx/v5 versions are affected?
Affected versions include releases prior to 5.9.0 across affected packages: github.com/jackc/pgx/v5.
What version fixes CVE-2026-33816?
Upgrading to 5.9.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/jackc/pgx/v5 affected?
Yes, github.com/jackc/pgx/v5 is affected in releases prior to 5.9.0. Upgrade your dependency to 5.9.0 or later.
What is the CVSS score of CVE-2026-33816?
CVE-2026-33816 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-33816?
CVE-2026-33816 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Go dependencies for CVE-2026-33816?
Run the dependency tree command: 'inspect dependencies for github.com/jackc/pgx/v5'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9jj7-4m8r-rfcm",
  "modified" : "2026-04-16T21:31:34Z",
  "published" : "2026-04-07T18:31:36Z",
  "aliases" : [ "CVE-2026-33816" ],
  "summary" : "Memory-safety vulnerability in github.com/jackc/pgx/v5.",
  "details" : "Memory-safety vulnerability in github.com/jackc/pgx/v5.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/jackc/pgx/v5"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.9.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33816"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jackc/pgx"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2026-4772"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T21:31:34Z",
    "nvd_published_at" : "2026-04-07T16:16:24Z"
  }
}