CVE-2026-32286: Github.com/jackc/pgproto3/v2 Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-jqcq-xjh3-6g23
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CVSS 7.5
CWE-129
Published
Advisory Summary

CVE-2026-32286 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-129: Improper Validation of Array Index) affecting Github.com/jackc/pgproto3/v2 libraries in the Go ecosystem. The issue involves denial of service in github.com/jackc/pgproto3/v2. Remediation is available in the latest vendor maintenance releases.

CVE-2026-32286 at a Glance

CVE Identifier CVE-2026-32286
GHSA Identifier GHSA-jqcq-xjh3-6g23
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-129: Improper Validation of Array Index
Affected Product Github.com/jackc/pgproto3/v2
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-2026-32286

To remediate this vulnerability, upgrade all affected Github.com/jackc/pgproto3/v2 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-2026-32286, inspect your project dependencies for Github.com/jackc/pgproto3/v2:

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

Analyze the terminal output to locate any version of Github.com/jackc/pgproto3/v2 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 Github.com/jackc/pgproto3/v2, 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

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.

CVE-2026-32286 Affected Github.com/jackc/pgproto3/v2 Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
github.com/jackc/pgproto3/v2
golang/github.com/jackc/pgproto3/v2
Go
≥ 2.0.0
≤ 2.3.3

References

NVD — CVE-2026-32286 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32286
Github.com/jackc/pgproto3/v2 Source Repository REPOSITORY
https://github.com/golang/vulndb/issues/4518
Github.com/jackc/pgproto3/v2 Source Repository REPOSITORY
https://github.com/jackc/pgx/issues/2507
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2448626
Github.com/jackc/pgproto3/v2 Source Repository REPOSITORY
https://github.com/jackc/pgproto3
pkg.go.dev/vuln/go-2026-4518 WEB
https://pkg.go.dev/vuln/GO-2026-4518
Github.com/jackc/pgproto3/v2 Security Information SECURITY
https://securityinfinity.com/research/memory-safety-vulnerabilities-in-go-postgresql-wire-protocol-parsers-pgproto3-pgx

Frequently Asked Questions

What is CVE-2026-32286?
CVE-2026-32286 is a security vulnerability in Github.com/jackc/pgproto3/v2 involving Denial of service in github.com/jackc/pgproto3/v2 under CWE-129: Improper Validation of Array Index.
Which Github.com/jackc/pgproto3/v2 versions are affected?
Affected versions include releases prior to current release patches across affected packages: github.com/jackc/pgproto3/v2.
What version fixes CVE-2026-32286?
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-2026-32286?
CVE-2026-32286 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-2026-32286?
CVE-2026-32286 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-2026-32286?
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-jqcq-xjh3-6g23",
  "modified" : "2026-03-30T20:33:03Z",
  "published" : "2026-03-18T13:00:31Z",
  "aliases" : [ "CVE-2026-32286" ],
  "summary" : "Denial of service in github.com/jackc/pgproto3/v2",
  "details" : "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.",
  "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" : "2.0.0"
      }, {
        "last_affected" : "2.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-32286"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/golang/vulndb/issues/4518"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jackc/pgx/issues/2507"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2448626"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jackc/pgproto3"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2026-4518"
  }, {
    "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" : "2026-03-18T13:00:31Z",
    "nvd_published_at" : "2026-03-26T20:16:12Z"
  }
}