{"id":"CVE-2026-75939","title":"A flaw was found in openshift/oc-mirror","summary":"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 v…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-347"],"vendor":"Red Hat","product":"openshift4/oc-mirror-plugin-rhel8","affected":["openshift4/oc-mirror-plugin-rhel8","openshift4/oc-mirror-plugin-rhel9 (all versions)"],"published":"2026-09-21","updated":"2026-09-21","sourceUpdated":"2026-09-21T15:17:31.520","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-75939","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-75939","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2517976","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75939.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-75939"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75939"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-21T14:38:56.373Z","slug":"CVE-2026-75939","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75939.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}