---
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: '2026-09-24'
sourceUpdated: '2026-09-24T14:18:16.770'
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
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-24T13:26:06.965773Z'
epss: 0.00311
epssPercentile: 0.21379
ingestedAt: '2026-09-21T14:38:56.373Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75939.json)