A flaw was found in OpenStack Glance. The web-download image import method can bypass host-based blocklist filtering. When an operator configures disallowed_hosts with IP addresses to block access to internal services, an attacker can circumvent this protection by using a hostname that resolves to the blocked IP address. The hostname-to-IP resolution result is not used for blocklist comparison, allowing an authenticated user to force the Glance server to make requests to internal network services that were intended to be blocked.
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History
Fri, 04 Sep 2026 12:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in OpenStack Glance. The web-download image import method can bypass host-based blocklist filtering. When an operator configures disallowed_hosts with IP addresses to block access to internal services, an attacker can circumvent this protection by using a hostname that resolves to the blocked IP address. The hostname-to-IP resolution result is not used for blocklist comparison, allowing an authenticated user to force the Glance server to make requests to internal network services that were intended to be blocked. | |
| Title | openstack-glance: openstack-glance: SSRF blocklist bypass via hostname-to-IP resolution gap in web-download | |
| Weaknesses | CWE-918 | |
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threat_severity
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cvssV3_1
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