---
id: "CVE-2026-96883"
kind: "vulnerability"
aliases: ["CVE-2026-96883"]
title: "pgcollection: type confusion lets an authenticated database user run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["aws", "lab-disclosure", "package", "pgcollection", "postgresql", "self-hosted"]
not_affected_if: ["managed-hosting", "rds-or-aurora"]
published_at: "2026-09-24T00:00:00+00:00"
first_seen_at: "2026-10-24T20:05:35+00:00"
updated_at: "2026-10-25T05:29:27+00:00"
sources: [{"source": "lab", "url": "https://aws.amazon.com/security/security-bulletins/rss/2026-118-aws/", "first_seen_at": "2026-10-24T20:05:35+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96883", "first_seen_at": "2026-10-24T20:15:27+00:00"}]
---

# pgcollection: type confusion lets an authenticated database user run code

pgcollection is an open source PostgreSQL extension from AWS. Requesting a stored collection value as an incompatible type makes the extension misread its data, so an authenticated database user can crash the PostgreSQL backend or execute arbitrary code.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed pgcollection version in each PostgreSQL database with `SELECT extversion FROM pg_extension WHERE extname = 'pgcollection';`
- Confirm whether the extension was compiled from the AWS GitHub repository rather than taken from Amazon RDS or Aurora, which the bulletin says ship 1.1.1

## Fix

- Upgrade self-compiled pgcollection to `2.1.2` or later
- Workarounds: unknown (the bulletin states none)

## Timeline

- 2026-10-24T20:05:35+00:00 lab https://aws.amazon.com/security/security-bulletins/rss/2026-118-aws/ — AWS: CVE-2026-96883 - Type confusion in AWS pgcollection allows remote code execution
- 2026-10-24T20:15:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-96883

## Documents

- [advisory] AWS: CVE-2026-96883 - Type confusion in AWS pgcollection allows remote code execution https://aws.amazon.com/security/security-bulletins/rss/2026-118-aws/

## From the sources

CVE-2026-96883 - Type confusion in AWS pgcollection allows remote code execution

### CVE-2026-96883 - Type confusion in AWS pgcollection allows remote code execution

Bulletin ID: 2026-118-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/24/2026 12:00 PM PDT

Description:

pgcollection is an open source extension to PostgreSQL. We identified CVE-2026-96883, an issue in pgcollection's type coercion logic. When requesting a stored icollection value as a type incompatible with how it was actually stored causes the extension to misinterprets the datum's representation, allowing an authenticated database user to crash the PostgreSQL backend or execute arbitrary code.

Impacted versions: pgcollection v2.0.0 through v2.1.1

Resolution:

This issue has been addressed in pgcollection version 2.1.2. This issue does not impact existing Amazon RDS for PostgreSQL and Amazon Aurora PostgreSQL customers. These services only ship 1.1.1 version, which does not contain this issue.

Customers who downloaded and compiled pgcollection 2.0.0 through 2.1.1 from the AWS GitHub repository and deployed them in their own PostgreSQL environments should upgrade to version 2.1.2 or later.

Workarounds:

None.

References:

- CVE-2026-96883 
- GHSA-g539-cj32-hv6r

 Please email aws-security@amazon.com with any security questions or concerns.

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