{"id":"CVE-2026-48978","aliases":["GHSA-xf85-363p-868w","GO-2026-5885"],"url":"https://o3.security/vulnerability/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.","published":"2026-07-17T19:34:53.690Z","modified":"2026-08-27T18:26:00.907458022Z","cvss":null,"epss":{"score":0.0026,"percentile":0.17616,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"oras.land/oras-go/v2","fixedVersion":"2.6.1"},{"ecosystem":"Go","name":"oras.land/oras-go","fixedVersion":null}],"fix":{"url":"https://github.com/oras-project/oras-go/commit/7a9f4b0b9558821b0422152ebe21ae56930fe764","label":"oras-project/oras-go@7a9f4b0"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T18:26:00.907458022Z"}}