# CVE-2026-18408

## Summary

- **CVE ID:** CVE-2026-18408
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-829
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 29, 2026

## Description

Untrusted data inclusion in pg_dump in PostgreSQL allows a malicious superuser of the origin server to inject arbitrary code for restore-time execution as the client operating system account running psql to restore the dump, via psql \restrict meta-command input expansion.  The fix for CVE-2025-8714 introduced \restrict and \unrestrict to block this attack, but \unrestrict itself was sufficient for an attack.  pg_dumpall is also affected.  pg_restore is affected when used to generate a plain-format dump.  Non-core use of \restrict would be affected, but we've not identified non-core use.  Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

## Affected Products

- n/a — PostgreSQL (18)
- n/a — PostgreSQL (17)
- n/a — PostgreSQL (16)
- n/a — PostgreSQL (15)
- n/a — PostgreSQL (0)

## References

- [CNA](https://www.postgresql.org/support/security/CVE-2026-18408/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._