CVE-2026-34742

Katalog CVE

CVSS 8.1 · High EPSS 0,66%

Kerentanan Initialization of a Resource with an Insecure Default pada lfprojects mcp go sdk. Skor CVSS 3.1 8.1 (High) menurut NVD.

Deskripsi (NVD)

The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.0, the Model Context Protocol (MCP) Go SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPHandler or SSEHandler, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. This issue has been patched in version 1.4.0.

Rincian

Terbit di NVD

2 April 2026

Terakhir diubah

24 Juli 2026

Status NVD

Modified

CVSS 3.1

8.1 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-1188: Initialization of a Resource with an Insecure Default

EPSS (30 hari)

0,66% peluang dieksploitasi; lebih tinggi dari 50,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-xw59-hvm2-8pj6 advisory vendor
• https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d patch
• https://github.com/modelcontextprotocol/go-sdk/pull/760 issue tracking · patch
• https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0 release notes
• https://access.redhat.com/errata/RHSA-2026:21772
• https://access.redhat.com/security/cve/CVE-2026-34742
• https://bugzilla.redhat.com/show_bug.cgi?id=2454608
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34742.json