Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-75939
Red Hat Red Hat OpenShift Container Platform 4.18 — Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H N N U H H N 7.4 .0038 30.2 —
AFFECTED
Product Versions Fixed
Red Hat OpenShift Container Platform 4.18 unspecified 1790828598
Red Hat OpenShift Container Platform 4 unspecified —
TIMELINE
Aug 18 Reserved by redhat
Sep 21 Published (CNA: redhat)
Oct 15 PATCH SHIPPED — CVE-2026-75939 (Red Hat OpenShift Container Platform 4.18). Fixed in Red Hat OpenShift Container Platform 4.18 1790828598.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| August 18, 2026 | Reserved | Reserved by redhat |
| September 21, 2026 | Published | Published (CNA: redhat) |
| October 15, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-75939 (Red Hat OpenShift Container Platform 4.18). Fixed in Red Hat OpenShift Container Platform 4.18 1790828598. |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat OpenShift Container Platform 4.18 | — | — | 1790828598 |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-75939 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
