CVE-2026-85732: oras-go: Blind SSRF via unvalidated Link header URL in pagination allows internal network probing

oras-go’s pagination helper parseLink() in registry/remote/utils.go follows the Link response header from a registry without validating the URL’s host or scheme. When a malicious registry returns a Link header containing an absolute URL pointing to an arbitrary host (e.g., a cloud metadata endpoint), the client makes GET requests to that host from the victim’s network.

This affects all pagination-based listing operations: Tags, Referrers, and Repositories (catalog).