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Fencer Intel
low 2.1

CVE-2026-48978 json

oras-go: Malicious registry can hijack Bearer token realm to exfiltrate credentials and refresh tokens

published 4mo ago modified 18d ago also EUVD-2026-45295 , GHSA-xf85-363p-868w , GO-2026-5885

cvss
2.1
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

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.

Patch / fix

  • go oras.land/oras-go/v2 2.6.1
  • linuxfoundation oras 2.6.1
  • golang-oras-oras-go Debian 14 2.6.2-1

debian advisories DEBIAN-CVE-2026-48978

  • helm Linux Micro 6.1 4.3.0-slfo.1.1_1.1
  • helm SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 4.3.0-160000.1.1
  • helm SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.21.3-160000.2.1
  • helm Linux Micro 6.1 3.21.3-slfo.1.1_2.1
  • helm Linux Micro 6.0 3.21.3-2.1
  • c-ares Linux Micro 6.2 1.34.8-160000.1.1
  • govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260727T201416-160000.1.1
  • helm Linux Micro 6.1 3.21.3-slfo.1.1_1.1

suse advisories SUSE-SU-2026:24282-1SUSE-SU-2026:23973-1SUSE-SU-2026:23984-1SUSE-SU-2026:23506-1SUSE-SU-2026:23688-1SUSE-SU-2026:23522-1

  • helm openSUSE Leap 16.0 4.3.0-160000.1.1
  • helm openSUSE Leap 16.0 3.21.3-160000.2.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260727T201416-160000.1.1
  • helm openSUSE Leap 16.0 3.21.2-160000.2.1
  • helm openSUSE Tumbleweed 4.2.2-2.1
  • helm3 openSUSE Tumbleweed 3.21.2-2.1

opensuse advisories openSUSE-SU-2026:21983-1openSUSE-SU-2026:21809-1openSUSE-SU-2026:21551-1openSUSE-SU-2026:21331-1openSUSE-SU-2026:11186-1openSUSE-SU-2026:11187-1

Is CVE-2026-48978 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-48978 updated cvss 3.1

oras-go: oras-go: Information disclosure and TLS downgrade via malicious registry realm

  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9 Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-rhel9-operator Red Hat OpenShift AI (RHOAI) rhoai/odh-ai-gateway-operator-rhel9, rhoai/odh-ogx-module-operator-rhel9, rhoai/odh-kserve-module-operator-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/cnf-tests-rhel8, openshift4/ose-console-rhel9, openshift4/ose-helm-operator, openshift4/ose-ansible-operator, openshift4/ose-olm-rukpak-rhel8, +17 more Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9, openshift5/metallb-rhel9-operator
    +3 more products
    Red Hat OpenStack Platform 16.2 rhosp-rhel8/osp-director-operator-bundle Red Hat OpenStack Platform 17.1 rhosp-rhel9/osp-director-operator-bundle Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle, rhoso-operators/rabbitmq-cluster-rhel9-operator
    affected: workaround, no fix available “Upgrade to oras-go v2.6.1 or later.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 2.1 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
CNA 4.0 2.1 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
go oras.land/oras-go/v2
<2.6.1
2.6.1
go oras.land/oras-go
<=1.2.7
 no fix listed

Affected products

  • oras-project oras-go

Classification

Weakness
  • CWE-918 Server-Side Request Forgery
  • CWE-319 Cleartext Transmission of Sensitive Information

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.