Critical severity · published Jul 21, 2026
CVE-2026-47040
Vulnerability in the Oracle Net Services component of Oracle Database Server
9.1
CVSS
0.5%
EPSS
No
On KEV
Description
Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.31, 21.3-21.22 and 23.4.0-23.26.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Net Services accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 9.1 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ON
Oracle Net Services · Oracle Corporation
19.3 through 19.31; 21.3 through 21.22; 23.4.0 through 23.26.2 · source: vendor
DS
Database Server · Oracle
19.3 through 19.31; 21.3 through 21.22; 23.4 through 23.26.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47040
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47040
Vendor Advisory
https://www.oracle.com/security-alerts/cpujul2026.html
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