CVE-2026-48978

Description

oras-go is a Go library for managing OCI artifacts. Prior to 2.6.1, auth.Client follows the realm URL from a registry's WWW-Authenticate: Bearer challenge without validating the scheme or host, allowing a malicious or compromised registry to cause SSRF to internal networks such as http://169.254.169.254/, http://10.0.0.x/, and http://127.0.0.1/, or to downgrade a registry contacted over https:// to an http:// token endpoint in registry/remote/auth/client.go through Client.Do(), Client.fetchBearerToken(), fetchDistributionToken, and fetchOAuth2Token. This issue is fixed in version 2.6.1.

References

• https://github.com/oras-project/oras-go/commit/7a9f4b0b9558821b0422152ebe21ae56930fe764
• https://github.com/oras-project/oras-go/releases/tag/v2.6.1
• https://github.com/oras-project/oras-go/security/advisories/GHSA-xf85-363p-868w