GHSA-V2GC-RM6G-WRW9 Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution

The SSRF validation in Craft CMS’s GraphQL Asset mutation uses gethostbyname, which only resolves IPv4 addresses. When a hostname has only AAAA IPv6 records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection...