---
id: CVE-2026-91499
title: Vulnerability in the RDBMS component of Oracle Database Server
summary: >-
  Vulnerability in the RDBMS component of Oracle Database Server.  Supported
  versions that are affected are 23.4.0-23.26.3. Easily exploitable
  vulnerability allows low privileged attacker having DBMS_VECTOR privilege with
  network access vi…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Oracle Corporation
product: Oracle Database Server
affected:
  - oracle_database_server >= 23.4.0 <= 23.26.3
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T21:26:17.575Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-91499'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
tags:
  - cve.org
ingestedAt: '2026-10-20T22:23:33.739Z'
---

## Overview

Vulnerability in the RDBMS component of Oracle Database Server.  Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows low privileged attacker having DBMS_VECTOR privilege with network access via Oracle Net to compromise RDBMS.  Successful attacks of this vulnerability can result in takeover of RDBMS. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

## Affected

- `oracle_database_server >= 23.4.0 <= 23.26.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.