{"id":"UBUNTU-CVE-2026-48978","details":"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.","modified":"2026-07-29T10:18:35.660421854Z","published":"2026-07-17T20:17:00Z","upstream":["CVE-2026-48978"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48978"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-48978"},{"type":"REPORT","url":"https://github.com/oras-project/oras-go/security/advisories/GHSA-xf85-363p-868w"}],"affected":[{"package":{"name":"golang-oras-oras-go","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/golang-oras-oras-go?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-oras-oras-go-dev","binary_version":"1.1.1-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48978.json"}},{"package":{"name":"golang-oras-oras-go","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/golang-oras-oras-go?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0-1","2.6.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-oras-oras-go-dev","binary_version":"2.6.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48978.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}