Vulnerabilities in pkg:golang/github.com/jackc/pgproto3/v2

PACKAGE
Advisory Identifier: GHSA-x6gf-mpr2-68h6
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Advisory Summary

CVE-2026-4427 is a HIGH (CVSS 7.5) pgproto3: negative field length panics vulnerability (CWE-129: Improper Validation of Array Index) affecting Duplicate Advisory libraries in the Go ecosystem. The issue involves pgproto3: negative field length panics in datarow.decode. Remediation is available in the latest vendor maintenance releases.

3 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/github.com/jackc/pgproto3/v2

3 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/github.com/jackc/pgproto3/v2. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-x6gf-mpr2-68h6 CVE-2026-4427 HIGH Duplicate Advisory: pgproto3: Negative field length panics in DataRow.Decode
GHSA-jqcq-xjh3-6g23 CVE-2026-32286 HIGH Denial of service in github.com/jackc/pgproto3/v2
GHSA-7jwh-3vrq-q3m8 - HIGH pgproto3 SQL Injection via Protocol Message Size Overflow

CVE-2026-4427 at a Glance

CVE Identifier CVE-2026-4427
GHSA Identifier GHSA-x6gf-mpr2-68h6
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-129: Improper Validation of Array Index
Affected Product Duplicate Advisory
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-4427

To remediate this vulnerability, upgrade all affected Duplicate Advisory 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/pgproto3/v2 fixed: Latest secure release 
Upgrade github.com/jackc/pgproto3/v2 to Latest secure release
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/pgproto3/v2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-4427, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for github.com/jackc/pgproto3/v2

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-129: Improper Validation of Array Index, where the product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. In Duplicate Advisory, 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

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-jqcq-xjh3-6g23. This link is maintained to preserve external references. ## Original Description A flaw was found in pgproto3. A malicious or compromised PostgreSQL server can exploit this by sending a DataRow message with a negative field length. This input validation vulnerability can lead to a denial of service (DoS) due to a slice bounds out of range panic.

CVE-2026-4427 Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
github.com/jackc/pgproto3/v2
golang/github.com/jackc/pgproto3/v2
Go
≤ 2.3.3

References

NVD — CVE-2026-4427 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4427
Duplicate Advisory Source Repository REPOSITORY
https://github.com/golang/vulndb/issues/4518
Duplicate Advisory Source Repository REPOSITORY
https://github.com/jackc/pgx/issues/2507
Duplicate Advisory Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-4427
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2448626
Duplicate Advisory Source Repository REPOSITORY
https://github.com/jackc/pgproto3
Duplicate Advisory Security Information SECURITY
https://securityinfinity.com/research/memory-safety-vulnerabilities-in-go-postgresql-wire-protocol-parsers-pgproto3-pgx

Frequently Asked Questions

What is CVE-2026-4427?
CVE-2026-4427 is a security vulnerability in Duplicate Advisory involving pgproto3: Negative field length panics in DataRow.Decode under CWE-129: Improper Validation of Array Index.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: github.com/jackc/pgproto3/v2.
What version fixes CVE-2026-4427?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/jackc/pgproto3/v2 affected?
Yes, github.com/jackc/pgproto3/v2 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-4427?
CVE-2026-4427 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-4427?
CVE-2026-4427 is classified under CWE-129: Improper Validation of Array Index (The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.).
How can I check Go dependencies for CVE-2026-4427?
Run the dependency tree command: 'inspect dependencies for github.com/jackc/pgproto3/v2'. 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-x6gf-mpr2-68h6",
  "modified" : "2026-03-30T21:09:40Z",
  "published" : "2026-03-19T15:31:22Z",
  "withdrawn" : "2026-03-30T21:09:40Z",
  "aliases" : [ "CVE-2026-4427" ],
  "summary" : "Duplicate Advisory: pgproto3: Negative field length panics in DataRow.Decode",
  "details" : "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-jqcq-xjh3-6g23. This link is maintained to preserve external references.\n\n## Original Description\nA flaw was found in pgproto3. A malicious or compromised PostgreSQL server can exploit this by sending a DataRow message with a negative field length. This input validation vulnerability can lead to a denial of service (DoS) due to a slice bounds out of range panic.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/jackc/pgproto3/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-4427"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/golang/vulndb/issues/4518"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jackc/pgx/issues/2507"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-4427"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2448626"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jackc/pgproto3"
  }, {
    "type" : "WEB",
    "url" : "https://securityinfinity.com/research/memory-safety-vulnerabilities-in-go-postgresql-wire-protocol-parsers-pgproto3-pgx"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-129" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-19T19:34:28Z",
    "nvd_published_at" : "2026-03-19T15:16:28Z"
  }
}