Improper input validation in Oracle Database Server - CVE-2026-21939
Published: January 20, 2026 / Updated: February 3, 2026
Vulnerability identifier: #VU121705
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21939
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Oracle
Affected software:
Oracle Database Server
Oracle Database Server
Detailed vulnerability description
The vulnerability allows a local non-authenticated attacker to execute arbitrary code.
The vulnerability exists due to improper input validation within the SQLcl in Oracle Database Server. A local non-authenticated attacker can exploit this vulnerability to execute arbitrary code.
How to mitigate CVE-2026-21939
Install updates from vendor's website.
Note, the vulnerability affects client-only installations.