HIGH

CVE-2026-75939

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

CVSS v3

7.4

HIGH

EPSS Score

0.3 %

exploit probability, as of 2026-09-28

CISA KEV

known exploited

Exploitation

—

SSVC status

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

Technical details

Published: 2026-09-21
Last Modified: 2026-09-22

Frequently asked questions

What is CVE-2026-75939?

Is CVE-2026-75939 actively exploited?

Active exploitation of CVE-2026-75939 has not been confirmed. Its EPSS score was 0.3% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-75939?

CVE-2026-75939 has a CVSS v3 base score of 7.4 (HIGH severity).

Is CVE-2026-75939 affecting your environment?

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