CVE-2026-75939

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.

• https://access.redhat.com/errata/RHSA-2026:79039
• https://access.redhat.com/security/cve/CVE-2026-75939
• https://bugzilla.redhat.com/show_bug.cgi?id=2517976