{"id":"CVE-2026-48978","summary":"oras-go: Malicious registry can hijack Bearer token realm to exfiltrate credentials and refresh tokens","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.","aliases":["GHSA-xf85-363p-868w","GO-2026-5885"],"modified":"2026-07-25T03:56:18.103249425Z","published":"2026-07-17T19:34:53.690Z","related":["CGA-fv49-j265-mmrc","SUSE-SU-2026:22603-1","SUSE-SU-2026:22650-1","SUSE-SU-2026:2823-1","openSUSE-SU-2026:11186-1","openSUSE-SU-2026:11187-1","openSUSE-SU-2026:21331-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-319","CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48978.json"},"references":[{"type":"WEB","url":"https://github.com/oras-project/oras-go/releases/tag/v2.6.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48978.json"},{"type":"ADVISORY","url":"https://github.com/oras-project/oras-go/security/advisories/GHSA-xf85-363p-868w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48978"},{"type":"FIX","url":"https://github.com/oras-project/oras-go/commit/7a9f4b0b9558821b0422152ebe21ae56930fe764"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/oras-project/oras-go","events":[{"introduced":"0"},{"fixed":"7a9f4b0b9558821b0422152ebe21ae56930fe764"},{"fixed":"47b7c804cb38a4af659ec735e473d3854c63a3c0"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.6.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v2.6.0","v2.5.0","v2.4.0","v2.3.0","v2.2.0","v2.1.0","v2.0.2","v2.0.1","v2.0.0","v2.0.0-rc.6","v2.0.0-rc.5","v2.0.0-rc.4","v2.0.0-rc.3","v2.0.0-rc.2","v2.0.0-rc.1","v2.0.0-alpha","v0.5.0","v0.4.0","v0.3.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}