samanhappy MCPHub up to 1.0.31 SSRF Guard src/utils/ssrf.ts isBlockedIpv6 server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, was found in samanhappy MCPHub up to 1.0.31. This impacts the function isBlockedIpv6 of the file src/utils/ssrf.ts of the component SSRF Guard. Such manipulation leads to server-side request forgery. This vulnerability is documented as CVE-2026-79749. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in samanhappy MCPHub up to 1.0.31. Affected by this issue is the function isBlockedIpv6 of the file src/utils/ssrf.ts of the component SSRF Guard. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-79749 since 08/25/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

Upgrading to version 1.0.32 eliminates this vulnerability.

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Productinfo

Vendor

• samanhappy

Name

• MCPHub

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18
• 1.0.19
• 1.0.20
• 1.0.21
• 1.0.22
• 1.0.23
• 1.0.24
• 1.0.25
• 1.0.26
• 1.0.27
• 1.0.28
• 1.0.29
• 1.0.30
• 1.0.31

Website

• Product: https://github.com/samanhappy/mcphub/

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