OpenStack Designate up to 20.0.1/21.0.0/22.0.1 mDNS _handle_notify input validation

Summaryinfo

A vulnerability marked as problematic has been reported in OpenStack Designate up to 20.0.1/21.0.0/22.0.1. This affects the function _handle_notify of the component mDNS Handler. The manipulation leads to input validation. This vulnerability is traded as CVE-2026-71194. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in OpenStack Designate up to 20.0.1/21.0.0/22.0.1 and classified as problematic. This issue affects the function _handle_notify of the component mDNS Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

In OpenStack Designate before 22.0.2, the mDNS handler performs pool-blind lookups when resolving record queries and NOTIFY requests. When two zones with the same name exist across different pools, the lookup fails with a deterministic error, causing the handler to return REFUSED for all DNS queries through that path. The _handle_notify path is exploitable via a single unauthenticated UDP packet. This is independently reachable through the cross-tenant zone overlap described in a different recent CVE, and also affects legitimate same-tenant cross-pool configurations. BIND9 views do not mitigate this issue as mDNS is a shared service upstream of any view configuration.

The advisory is shared at launchpad.net. The identification of this vulnerability is CVE-2026-71194 since 08/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 20.0.2, 21.0.1 or 22.0.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-57692). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Cloud Software

Vendor

• OpenStack

Name

• Designate

Version

• 20.0.0
• 20.0.1
• 21.0
• 22.0.0
• 22.0.1

License

• free

Website

• Vendor: https://www.openstack.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion