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CVE-2026-79749— MCPHub: SSRF Guard Bypass via IPv6 Transition Addresses in URL Validation

Quick assessment

Affected
samanhappy mcphub
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCPHub 是一个统一的中心化管理和动态编排多个 MCP 服务器/API 到独立端点的平台，支持灵活的路由策略。 在 1.0.32 版本之前，MCPHub 位于 中的 SSRF 防护机制使用了自定义的 函数，该函数仅检查环回地址、链路本地地址、唯一本地地址、IPv4 映射地址以及 IPv4 兼容 IPv6 地址。然而，IPv6 过渡地址族——包括 NAT64（64:ff9b::/96）、6to4（2002::/16）和 Teredo（2001::/32）——并未被纳入检查范围。 因此，能够指定 MCP 服务器连接

CVSS 7.6 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
samanhappy mcphub < 1.0.32 affected
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I. Basic Information for CVE-2026-79749

Vulnerability Information
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Vulnerability Title
MCPHub: SSRF Guard Bypass via IPv6 Transition Addresses in URL Validation
Source: CVE Program / CVE List V5
Vulnerability Description
MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 1.0.32, MCPHub's SSRF guard in src/utils/ssrf.ts uses a custom isBlockedIpv6 function that only checks for loopback, link-local, unique-local, IPv4-mapped, and IPv4-compatible IPv6 addresses. IPv6 transition address families -- NAT64 (64:ff9b::/96), 6to4 (2002::/16), and Teredo (2001::/32) -- are not checked. An attacker who can specify a URL for an MCP server connection can encode a private IPv4 address inside one of these IPv6 forms to bypass the SSRF guard and reach internal infrastructure. This issue has been patched in version 1.0.32.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
samanhappy mcphub < 1.0.32 -

II. Public POCs for CVE-2026-79749

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III. Intelligence Information for CVE-2026-79749

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Patches & Fixes for CVE-2026-79749 (2)

Vendor Advisories for CVE-2026-79749 (1)

Vendor Pages for CVE-2026-79749 (1)

Same Patch Batch · samanhappy · 2026-08-31 · 8 CVEs total

CVE-2026-79748 9.9 CRITICAL MCPHub: Authenticated non-admin user achieves RCE via POST /api/servers (missing authoriza
CVE-2026-79744 8.8 HIGH MCPHub: Missing Authorization on `PUT /api/system-config` Lets Any Non-Admin Rewrite Globa
CVE-2026-79746 8.1 HIGH MCPHub: Server-scoped bearer key gains access to an entire group via partial (any-overlap)
CVE-2026-79750 7.7 HIGH MCPHub authenticated horizontal IDOR: any non-admin user executes tools on other users' MC
CVE-2026-79745 7.1 HIGH MCPHub: Missing Authorization on Built-in Prompt & Resource CRUD (Unauthorized Tampering o
CVE-2026-79747 7.1 HIGH MCPHub vulnerable to SSRF: a non-admin user can make mcphub request arbitrary URLs and rea
CVE-2026-79743 6.9 MEDIUM MCPHub: Path Traversal via Malicious MCPB Manifest Name

IV. Related Vulnerabilities

Same product: mcphub
Same vendor: samanhappy
Same weakness: CWE-918

V. Comments for CVE-2026-79749

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