What’s Vulnerable › Vulnerabilities

CVE-2026-75939: Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-10-15
• Weakness: CWE-347

Description

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 OpenShift Container Platform 4.18: all versions — fixed in 1790828598

How to fix

Upgrade to a fixed version: Red Hat OpenShift Container Platform 4.18 1790828598. Check the vendor advisory for mitigations.

References

• 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

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