CVE-2026-75939
Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed
- State
- Published
- Severity
- 7.4 High
- Published
- Sep 21, 2026
- Updated
- Oct 15, 2026
- Reserved
- Aug 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | redhat |
Weaknesses
- CWE-347 Improper Verification of Cryptographic Signature
Affected Products
| Product | Versions |
|---|---|
Red Hat OpenShift Container Platform 4.18Red Hat |
|
Red Hat OpenShift Container Platform 4Red Hat |
References
- RHSA-2026:79039vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-75939vdb-entry
- RHBZ#2517976issue-tracking
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