Red Hat mirror registry for OpenShift/Quay Mirror configuration endpoints/api/mirror.py validate_external_registry_url external_reference server-side request forgery

Summaryinfo

A vulnerability categorized as problematic has been discovered in Red Hat mirror registry for OpenShift and Quay. Affected is the function validate_external_registry_url of the file endpoints/api/mirror.py of the component Mirror configuration. The manipulation of the argument external_reference results in server-side request forgery. This vulnerability was named CVE-2026-15927. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in Red Hat mirror registry for OpenShift and Quay (affected version unknown). Affected is the function validate_external_registry_url of the file endpoints/api/mirror.py of the component Mirror configuration. The manipulation of the argument external_reference with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in Red Hat Quay's repository-level mirror configuration feature. The POST and PUT handlers in endpoints/api/mirror.py accept an external_reference parameter without SSRF validation, unlike the organization-level mirror handlers which apply validate_external_registry_url(). A repository administrator can supply a crafted hostname that causes the Quay mirror worker to make requests via Skopeo to internal network services, cloud metadata endpoints, or other resources not intended to be reachable from the Quay application.

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-15927 since 07/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are necessary for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/21/2026).

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 vulnerability database at EUVD (EUVD-2026-46150). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Virtualization Software

Vendor

• Red Hat

Name

• mirror registry for OpenShift
• Quay

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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