Oracle Database Server up to 23.26.3 Oracle Net Services resource consumption

Summaryinfo

A vulnerability was found in Oracle Database Server up to 23.26.3. It has been rated as critical. This impacts an unknown function of the component Oracle Net Services. This manipulation causes resource consumption. The identification of this vulnerability is CVE-2026-83333. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Oracle Database Server up to 23.26.3 and classified as critical. Affected by this vulnerability is an unknown function of the component Oracle Net Services. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.3. 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 ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

It is possible to read the advisory at oracle.com. This vulnerability is known as CVE-2026-83333 since 08/31/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/16/2026). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Database Software

Vendor

• Oracle

Name

• Database Server

Version

• 23.26.0
• 23.26.1
• 23.26.2
• 23.26.3

License

• commercial

Website

• Vendor: https://www.oracle.com

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