---
id: "CVE-2026-105615"
kind: "vulnerability"
aliases: ["CVE-2026-105615"]
title: "PostgreSQL Anonymizer: masked roles can read statistics histograms and MCVs"
severity: "low"
cvss: 3.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["data-masking", "package", "postgresql", "postgresql-anonymizer"]
not_affected_if: ["anon-extension-not-used", "no-masked-roles"]
published_at: "2026-10-28T18:17:03+00:00"
first_seen_at: "2026-10-28T18:34:32+00:00"
updated_at: "2026-10-28T18:35:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105615", "first_seen_at": "2026-10-28T18:34:32+00:00"}]
---

# PostgreSQL Anonymizer: masked roles can read statistics histograms and MCVs

PostgreSQL Anonymizer's optimized statistics on a table stay visible to any role with SELECT on that table, even when the role is supposed to see only masked data. A masked role can read a limited subset of the underlying data through the histograms and mcvs columns of the statistics view.

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

## How to check

- Check the installed extension version with `SELECT extversion FROM pg_extension WHERE extname = 'anon';`
- Review which roles are masked with anon and whether they hold SELECT on tables that have optimized statistics

## Fix

- Upgrade PostgreSQL Anonymizer to `3.3.0` or later

## Timeline

- 2026-10-28T18:34:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-105615

## From the sources

PostgreSQL's optimized statistics on a table are visible as long as you have SELECT privilege on said table. A masked role can therefore read a limited subset of the data through the statistics view's histograms and mcvs. The vulnerability is resolved in PostgreSQL Anonymizer 3.3.0 and later versions.

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