{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-79749","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-25T14:08:18.109Z","datePublished":"2026-08-31T17:54:45.423Z","dateUpdated":"2026-08-31T18:48:57.445Z"},"containers":{"cna":{"title":"MCPHub: SSRF Guard Bypass via IPv6 Transition Addresses in URL Validation","problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.6,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"references":[{"name":"https://github.com/samanhappy/mcphub/security/advisories/GHSA-pr4x-3pc7-2fhw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/samanhappy/mcphub/security/advisories/GHSA-pr4x-3pc7-2fhw"},{"name":"https://github.com/samanhappy/mcphub/pull/1069","tags":["x_refsource_MISC"],"url":"https://github.com/samanhappy/mcphub/pull/1069"},{"name":"https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552","tags":["x_refsource_MISC"],"url":"https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552"},{"name":"https://github.com/samanhappy/mcphub/releases/tag/v1.0.32","tags":["x_refsource_MISC"],"url":"https://github.com/samanhappy/mcphub/releases/tag/v1.0.32"}],"affected":[{"vendor":"samanhappy","product":"mcphub","versions":[{"version":"< 1.0.32","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-31T17:54:45.423Z"},"descriptions":[{"lang":"en","value":"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":{"advisory":"GHSA-pr4x-3pc7-2fhw","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/samanhappy/mcphub/security/advisories/GHSA-pr4x-3pc7-2fhw","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-31T18:48:33.754446Z","id":"CVE-2026-79749","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-31T18:48:57.445Z"}}]}}