Red Hat 389-ds-base get_ldapmessage_controls_ext allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in Red Hat 389-ds-base. Affected by this vulnerability is the function get_ldapmessage_controls_ext. The manipulation results in allocation of resources. This vulnerability was named CVE-2026-9064. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Red Hat 389-ds-base (affected version unknown). It has been classified as problematic. Affected is the function get_ldapmessage_controls_ext. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-9064 since 05/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/22/2026). The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 315777 (Linux Distros Unpatched Vulnerability : CVE-2026-9064), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the databases at Tenable (315777), EUVD (EUVD-2026-31079) and CERT Bund (WID-SEC-2026-1957). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• RESF Rocky Linux

Productinfo

Vendor

• Red Hat

Name

• 389-ds-base

License

• open-source

Website

• Vendor: https://www.redhat.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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