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CVE-2026-75939 is an improper cryptographic signature verification flaw in the OpenShift oc-mirror tool. The affected implementation checks for PGP signature errors before processing the complete signed message body. Consequently, a specially crafted PGP message carrying a valid Red Hat release key identifier but a forged signature can be treated as trusted. The flaw affects the openshift4/oc-mirror-plugin-rhel9 component in Red Hat OpenShift Container Platform 4; the RHEL 8 plugin component is not affected because it is not present.
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A CVSS 7.4 PGP signature-verification bypass in Red Hat OpenShift oc-mirror. An attacker able to intercept or alter traffic between oc-mirror and its signature endpoint could cause a forged, malicious OpenShift release image to be mirrored into a disconnected private registry, creating a software supply-chain risk.
An Important-severity PGP signature-verification bypass in Red Hat OpenShift's oc-mirror tool. An attacker able to intercept or alter traffic between oc-mirror and its signature endpoint could supply a forged message carrying a valid Red Hat release key ID, causing malicious release images to be mirrored into disconnected OpenShift registries.
A signature-verification bypass in openshift/oc-mirror. An attacker able to intercept or manipulate traffic to the signature endpoint can craft a PGP message using a valid Red Hat release-key ID and a forged signature, causing oc-mirror to accept and mirror a malicious release payload into a disconnected registry.
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Cross-references every affected SKU, including bundled OEM variants.
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