---
id: "CVE-2026-116306"
page: "https://infrastack.ai/live/CVE-2026-116306"
kind: "vulnerability"
aliases: ["CVE-2026-116306"]
title: "PostgreSQL: composite-value type confusion lets an object creator run OS code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["database", "postgresql", "runtime", "self-hosted"]
not_affected_if: ["patched-versions"]
published_at: "2026-11-12T15:17:38+00:00"
first_seen_at: "2026-11-12T15:41:53+00:00"
updated_at: "2026-11-12T15:43:39+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116306", "first_seen_at": "2026-11-12T15:41:53+00:00"}]
exploit_sources: []
---

# PostgreSQL: composite-value type confusion lets an object creator run OS code

Link for people: https://infrastack.ai/live/CVE-2026-116306 (this .md is for agents)

A type confusion bug in PostgreSQL's composite-value field assignment lets a user who can create database objects change a composite type between deforming and reforming a value. The result is arbitrary code execution as the operating system user running the database.

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

## How to check

- Run `SELECT version();` in psql and compare against the fixed versions below.

## Fix

- PostgreSQL `18.7`
- PostgreSQL `17.12`
- PostgreSQL `16.16`
- PostgreSQL `15.20`
- PostgreSQL `14.25`

## Timeline

- 2026-11-12T15:41:53+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116306

## From the sources

Type confusion in PostgreSQL composite-value field assignment allows an object creator to execute arbitrary code as the operating system user running the database, via changing a composite type between deforming and reforming a value.  Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_