---
id: "CVE-2026-116489"
kind: "vulnerability"
aliases: ["CVE-2026-116489"]
title: "pgvectorscale: type confusion lets low-privileged database users corrupt memory"
severity: "high"
cvss: 7.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["managed-postgres", "package", "pgvector", "pgvectorscale", "postgresql", "self-hosted"]
not_affected_if: ["no-untrusted-db-users", "pgvectorscale-0.9.1-or-later"]
published_at: "2026-10-26T16:17:18+00:00"
first_seen_at: "2026-10-26T16:31:01+00:00"
updated_at: "2026-10-26T16:32:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116489", "first_seen_at": "2026-10-26T16:31:01+00:00"}]
---

# pgvectorscale: type confusion lets low-privileged database users corrupt memory

Timescale pgvectorscale before 0.9.1 can be made to confuse pgvector's vector type by shadowing it with attacker-created objects in the vectorscale schema. A database user with CREATE privilege on that schema can then build and query DiskANN indexes to trigger out-of-bounds reads and writes, leaking memory, crashing the server, or escalating privileges.

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

## How to check

- Check the installed pgvectorscale version with `SELECT extversion FROM pg_extension WHERE extname = 'vectorscale';`
- List who can create objects in the vectorscale schema with `\dn+ vectorscale` in psql
- unknown whether the sources give a specific file or setting to inspect beyond this

## Fix

- Upgrade pgvectorscale to `0.9.1` or later
- Revoke CREATE on the vectorscale schema from untrusted roles until the upgrade is applied

## Timeline

- 2026-10-26T16:31:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116489

## From the sources

Timescale pgvectorscale before 0.9.1 contains a type confusion vulnerability that allows low-privileged database users to corrupt memory by shadowing pgvector's vector type or operators. Attackers with CREATE privilege on the vectorscale schema can pre-create shadow objects, then build and query DiskANN indexes over crafted values to cause out-of-bounds reads and writes, disclosing memory, crashing the server, or escalating privileges.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_