Improper input validation in Oracle Database Server - CVE-2026-47040
Published: November 7, 2026
Vulnerability identifier: #VU159858
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-47040
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read data or crash the application.
The vulnerability exists due to improper input validation within the Oracle Net Services in Oracle Database Server. A remote non-authenticated attacker can exploit this vulnerability to read data or crash the application.
Affected software
Oracle Database Server
How to mitigate CVE-2026-47040
Install updates from vendor's website.
Oracle Database Server - addressed in versions 20c, 23a