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Fencer Vulns
low 2.1

CVE-2026-48978 json

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

published 2026-07-01 4 mo ago modified 2026-10-24 15 d ago also GHSA-xf85-363p-868w , GO-2026-5885 , EUVD-2026-45295

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
  • 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

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
3 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.