Vulnerability in Oracle Corporation Oracle Net Services

[ Description ]Official description

Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. Easily exploitable vulnerability allows high privileged attacker having None privilege with logon to the infrastructure where Oracle Net Services executes to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 4.4 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• CERT-FR21 Oct 2026CERTFR-2026-AVI-1349

  Multiple vulnerabilities in Oracle Database Server Translated from French

  Multiple vulnerabilities have been discovered in Oracle Database Server. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality.

  CVE-2026-91499CVE-2026-93565CVE-2026-93494+41 more CVEs
• BSI CERT-Bund20 Oct 2026WID-SEC-2026-4061

  Oracle Database Server: Multiple vulnerabilities Translated from German

  CVE-2026-91615CVE-2026-59889CVE-2026-101510+10 more CVEs

[ References ]References

• www.oracle.com/security-alerts/cpuoct2026.html