CVE-2026-116316
Description
A flaw was found in PostgreSQL. An authenticated database user can achieve privilege escalation and execute arbitrary SQL commands with the permissions of another session. By defining a custom data type in a temporary schema (pg_temp), an attacker can cause a victim's security-restricted operation to execute malicious code when processing unqualified type names.
Statement
Red Hat has evaluated this vulnerability as having an Important impact because it allows an authenticated database user to gain elevated privileges and execute arbitrary SQL commands in the context of another session. In multi-tenant environments where multiple users connect to the same PostgreSQL instance, an attacker can create custom types in the temporary schema to hijack queries that omit schema qualification during security-restricted operations. While standard background maintenance tasks such as autovacuum do not execute queries with unqualified type casts and are unaffected, environments that allow untrusted users to connect and execute arbitrary database operations remain exposed.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.8 | N/A | 8.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability
Technical Impact: Execute Unauthorized Code or Commands
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