CVE-2026-33252: GO-2026-4773 - Cross-Site Tool Execution for HTTP Servers without Authorizatrion in github.com/modelcontextprotocol/go-sdk

CVE-2026-33252 · Severity: low · CVSS 3.1 · Published 2026-03-23

Cross-Site Tool Execution for HTTP Servers without Authorizatrion in github.com/modelcontextprotocol/go-sdk

Technologies: github.com/modelcontextprotocol/go-sdk (Go). Vendors: Go.

Quick answers

Is CVE-2026-33252 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33252 being exploited in the wild.
How severe is CVE-2026-33252?
Low severity, with a CVSS score of 3.1, published 23 March 2026.
Which products and versions are affected?
github.com/modelcontextprotocol/go-sdk (Go) SEMVER:introduced=0,fixed=1.4.1.
Is there a fix for CVE-2026-33252?
Yes. github.com/modelcontextprotocol/go-sdk (Go): upgrade to 1.4.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33252?
Check whether you run github.com/modelcontextprotocol/go-sdk (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/modelcontextprotocol/go-sdk (Go): upgrade to 1.4.1 or later
    go get github.com/modelcontextprotocol/go-sdk@v1.4.1

Affected products

  • github.com/modelcontextprotocol/go-sdk (Go) SEMVER:introduced=0,fixed=1.4.1

Identifiers

  • CVE-2026-33252
  • GHSA-89xv-2j6f-qhc8
  • GO-2026-4773

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