High8.0Red Hat Linux

High [CVE-2026-34742] Model Context Protocol (MCP) Go SDK: DNS rebinding vulnerability allows unauthorized access

This high-severity Red Hat Linux advisory covers CVE-2026-34742 affecting Red Hat OpenShift Dev Spaces 3.28, OpenShift Serverless.

CVE-2026-34742 Published Apr 2, 2026

CVE-2026-34742

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

Model Context Protocol (MCP) Go SDK: DNS rebinding vulnerability allows unauthorized access. Red Hat rates this important (CVSS 8).

Weakness: CWE-1188. Affected package(s): devspaces/udi-rhel9:1779829736.

Resolved in Red Hat advisory RHSA-2026:21772 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat OpenShift Dev Spaces 3.28; OpenShift Serverless.

Affected versions

devspaces/udi-rhel9:1779829736

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:21772

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:21772 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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