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CVE-2026-79749

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

HIGH
7.6
CVSS Score
Published: August 31, 2026 at 05:54 PM UTC
Updated: September 8, 2026 at 09:19 PM UTC
1 product affected across 1 vendorMCPHub

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Severity
HIGH7.6
Exploit prediction
EPSS 0.4%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MCPHub· Samanhappy
60%
v < 1.0.32
Affected range stops below 1.0.32, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/samanhappy/mcphub/security/advisories/GHSA-pr4x-3pc7-2fhw
x_refsource_MISC
Source: cverecord
https://github.com/samanhappy/mcphub/pull/1069
x_refsource_MISC
Source: cverecord
https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552
x_refsource_MISC
Source: cverecord
https://github.com/samanhappy/mcphub/releases/tag/v1.0.32

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.6HIGHGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-918

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