Medium [CVE-2026-50151] Credential forwarding via unvalidated Location header during blob upload
This medium-severity Red Hat Linux advisory covers CVE-2026-50151 affecting Multicluster Global Hub 1.4.9, Multicluster Global Hub 1.5.8, Multicluster Global Hub 1.6.6.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
oras-go is a Go library for managing OCI artifacts.
Prior to 2.6.1, registry/remote/repository.go in blobStore.completePushAfterInitialPost follows a registry-controlled Location header during monolithic blob upload and reuses the Authorization header from the initial POST request for the subsequent PUT request, allowing a malicious registry to return a cross-host Location and receive the caller's credentials at an attacker-controlled endpoint.
This issue is fixed in version 2.6.1. A flaw was found in oras-go.
Additionally, it can enable client-side Server-Side Request Forgery (SSRF) to a cross-host target. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-522.
Affected Red Hat products: Multicluster Global Hub 1.4.9; Multicluster Global Hub 1.5.8; Multicluster Global Hub 1.6.6; Multicluster Global Hub 1.7.3; Multicluster Global Hub 1.8.2; Red Hat Advanced Cluster Management for Kubernetes 2.13; OpenShift Service Mesh 3; Red Hat Advanced Cluster Security 4; Red Hat OpenShift Container Platform 4; Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1; Red Hat OpenStack Platform 18.0.
Red Hat lists Gatekeeper 3 as not affected. Red Hat fixing advisory: RHSA-2026:67516, RHSA-2026:71597, RHSA-2026:73419, RHSA-2026:67842, RHSA-2026:68515, RHSA-2026:73038, RHSA-2026:47737.
Is CVE-2026-50151 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-50151 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-50151?
Upgrade to a fixed release named by Red Hat:
- 2.6.1
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1788375682
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1789515639
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1790086248
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1788376193
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1788441983
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1790639009
- rhacm2/multicloud-integrations-rhel9:1784652040
- rhacm2/multicluster-operators-channel-rhel9:1784741269
- rhacm2/multicluster-operators-subscription-rhel9:1784740143
- RHSA-2026:67516
- RHSA-2026:71597
5 more fixed releases are listed below.
Confirm against the vendor advisory before you patch.
- < 2.6.1
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
- 2.6.1
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1788375682
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1789515639
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1790086248
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1788376193
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1788441983
- multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1790639009
- rhacm2/multicloud-integrations-rhel9:1784652040
- rhacm2/multicluster-operators-channel-rhel9:1784741269
- rhacm2/multicluster-operators-subscription-rhel9:1784740143
- RHSA-2026:67516
- RHSA-2026:71597
- RHSA-2026:73419
- RHSA-2026:67842
- RHSA-2026:68515
- RHSA-2026:73038
- RHSA-2026:47737
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- Upgrade to oras-go v2.6.1 or later.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
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