High 7.6Published Aug 31, 2026

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

Updated under an hour ago (2026-10-19 11:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.6 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Aug 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

samanhappy mcphub samanhappy:mcphub (from the name)	before 1.0.32	CNA record

References

https://github.com/samanhappy/mcphub/security/advisories/GHSA-pr4x-3pc7-2fhwx-refsource-confirm
https://github.com/samanhappy/mcphub/pull/1069x-refsource-misc
https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552x-refsource-misc
https://github.com/samanhappy/mcphub/releases/tag/v1.0.32x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.