Paper/Archive/CVE-2026-47040

CVE-2026-47040

Oracle Corporation Oracle Net Services — Vulnerability in the Oracle Net Services component of Oracle Database Server.

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 42.4.424 × 208.5 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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).

Affected

ProductAffectedFixed inSource

Oracle Net Services19.3 – 19.31–CNA

Oracle Net Services21.3 – 21.22–CNA

Oracle Net Services23.4.0 – 23.26.2–CNA

Scores by source

oracle (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

advisoryoracle.com/security-alerts/cpujul2026.html