Improper Verification of Source of a Communication Channel Affecting golang1.25 package, versions *


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.18% (8th percentile)

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  • Snyk IDSNYK-RHEL10-GOLANG125-15994765
  • published12 Apr 2026
  • disclosed23 Mar 2026

Introduced: 23 Mar 2026

CVE-2026-33252  (opens in a new tab)
CWE-940  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 golang1.25.

NVD Description

Note: Versions mentioned in the description apply only to the upstream golang1.25 package and not the golang1.25 package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site POST requests without validating the Origin header and without requiring Content-Type: application/json. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.

CVSS Base Scores

version 3.1