CVE-2026-75939: Red Hat Openshift Container Platform 4

High severity, CVSS 7.4. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in openshift/oc-mirror. The tool incorrectly verifies PGP (Pretty Good Privacy) release image signatures by checking for signature errors before the entire signed body is processed, leading to a bypass of the signature verification. A remote attacker, by intercepting or manipulating network traffic to the signature endpoint, could exploit this to craft a PGP message with a valid Red Hat release key ID but a forged signature. This enables the `oc-mirror` tool to accept and mirror a malicious release payload into a disconnected registry, potentially compromising the integrity of software deployments.

Affected products

• Red Hat Red Hat Openshift Container Platform 4

Published 2026-09-21. Last modified 2026-09-24.