CVE-2026-75939 Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed
Attackers can bypass PGP signature verification in oc-mirror to inject malicious payloads into disconnected registries, compromising deployment integrity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75939?
CVE-2026-75939 is a high-severity vulnerability in Red Hat OpenShift Container Platform 4, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2026-75939?
How do I fix CVE-2026-75939?
No fix has been published for CVE-2026-75939 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-75939 being exploited?
There is no known exploitation of CVE-2026-75939 in the wild and no public exploit code.
Sources
Also known as GHSA-vhqx-cfmx-mjq9.