CVE-2026-75939

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

Published Sep 21, 2026 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:5
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Redhat openshift Container Platform
Vendors & Products Redhat openshift Container Platform
Type Values Removed Values Added
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.
Title Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed
First Time appeared Redhat
Redhat openshift
Weaknesses CWE-347
CPEs cpe:/a:redhat:openshift:4
Vendors & Products Redhat
Redhat openshift
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 6, 2026, 10:43 PM
Reserved
Aug 18, 2026, 3:55 PM
Status
Awaiting Analysis
Published
Sep 21, 2026, 3:17 PM
Modified
Nov 6, 2026, 11:17 PM
Severity
Important
Public date
Sep 21, 2026, 1:27 PM