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TI-2026-55230 Aliases CVE-2026-79749

MCPHub: SSRF Guard Bypass via IPv6 Transition Addresses in URL Validation

Priority HIGH 68CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00449 39th percentileScored 2026-11-07
Fix Fixed mcphub (samanhappy): 1.0.32

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
samanhappymcphubbefore 1.0.321.0.32Patch availableCNA
  • mcphub Vendorsamanhappy Affected before 1.0.32 Fixed in 1.0.32 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:mcphubx:mcphub:*:*:*:*:*:*:*:*——samanhappy
  • cpe:2.3:a:mcphubx:mcphub:*:*:*:*:*:*:*:* Versions — — ·samanhappy

Remediation

  • Fix · CNA mcphub (samanhappy) Fixed in 1.0.32

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-79749

References

Other 4

  • TI-2026-55229 MCPHub: Authenticated non-admin user achieves RCE via POST /api/servers (missing authorization on stdio command/args) CVSS 3.1CRITICAL 9.9
  • TI-2026-55225 MCPHub: Missing Authorization on `PUT /api/system-config` Lets Any Non-Admin Rewrite Global Security Configuration CVSS 3.1HIGH 8.8
  • TI-2026-55224 MCPHub: Path Traversal via Malicious MCPB Manifest Name CVSS 4.0MEDIUM 6.9
  • TI-2025-10335 samanhappy MCPHub sseService.ts handleSseConnectionfunction improper authentication CVSS 4.0MEDIUM 6.9
  • TI-2026-61501 MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass CVSS 4.0HIGH 7.6
  • TI-2026-55231 Authorization bypass in samanhappy mcphub CVSS 3.1HIGH 7.7
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences