{"id":"EUVD-2026-78817","enisaUuid":"7444a9ba-97b3-3a05-a6d4-39594cefe9ea","description":"ToolHive is a utility designed to simplify the deployment and management of Model Context Protocol (MCP) servers. Prior to 0.29.1, networking.IsPrivateIP in pkg/networking/utilities.go omits the IPv6 NAT64 prefixes 64:ff9b::/96 and 64:ff9b:1::/48, so NAT64 addresses embedding private, loopback, or link-local IPv4 targets are classified as public and allowed. The most direct attacker-controlled path begins when an external OAuth client supplies a client_id URL that CIMDStorageDecorator.GetClient routes through FetchClientMetadataDocument in pkg/oauthproto/cimd/fetch.go; protectedDialerControl in pkg/networking/http_client.go and validateHost in pkg/skills/gitresolver/reference.go share the defective classification but use operator-controlled or user-controlled destinations. On a ToolHive host behind a NAT64/DNS64 gateway, the gateway translates an allowed address such as 64:ff9b:1::a9fe:a9fe to 169.254.169.254, permitting blind probing of internal TCP or TLS reachability. The attacker-controlled CIMD path requires HTTPS, verifies certificates, and does not reflect response bodies, so the established impact is an internal reachability oracle rather than metadata credential exfiltration; the webhook client is not affected because it does not use this IP guard. This issue is fixed in version 0.29.1.","datePublished":"Sep 15, 2026, 3:47:39 PM","dateUpdated":"Sep 15, 2026, 4:13:16 PM","baseScore":2.9,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","references":"https://github.com/stacklok/toolhive/security/advisories/GHSA-pph6-vfjv-vpjw\nhttps://github.com/stacklok/toolhive/commit/26912af453d2040787983dbc9ab93a9019ec0468\nhttps://github.com/stacklok/toolhive/releases/tag/v0.29.1\n","aliases":"CVE-2026-54450\nGHSA-pph6-vfjv-vpjw\n","assigner":"GitHub_M","epss":0.33,"enisaIdProduct":[{"id":"0ed9149f-b5f0-3160-812a-08bfbb666f03","product":{"name":"toolhive","vendor":{"name":"stacklok"}},"product_version":"\u003c 0.29.1"}],"enisaIdVendor":[{"id":"9832c7ec-1a01-396b-b936-5746925a65ff","vendor":{"name":"stacklok"}}],"enisaIdVulnerability":[{"id":"1311842c-06db-3fa7-81d0-54e4a16baa48","vulnerability":{"id":"GHSA-pph6-vfjv-vpjw","description":"ToolHive: SSRF guard misses IPv6 NAT64 ranges (64:ff9b::/96, 64:ff9b:1::/48), allowing metadata/internal access behind a NAT64 gateway","datePublished":"Jul 15, 2026, 9:51:03 PM","dateUpdated":"Jul 15, 2026, 9:51:03 PM","baseScore":0.0,"references":"https://github.com/stacklok/toolhive/security/advisories/GHSA-pph6-vfjv-vpjw\nhttps://github.com/stacklok/toolhive\n","enisa_id":"EUVD-2026-78817\n","aliases":"CVE-2026-54450\nGHSA-pph6-vfjv-vpjw\n","epss":0.0,"dataProcessed":"Nov 9, 2026, 3:50:23 PM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"6d502efa-2c6c-3e2f-952f-eb3327bef63b","vulnerability":{"id":"CVE-2026-54450","description":"ToolHive is a utility designed to simplify the deployment and management of Model Context Protocol (MCP) servers. Prior to 0.29.1, networking.IsPrivateIP in pkg/networking/utilities.go omits the IPv6 NAT64 prefixes 64:ff9b::/96 and 64:ff9b:1::/48, so NAT64 addresses embedding private, loopback, or link-local IPv4 targets are classified as public and allowed. The most direct attacker-controlled path begins when an external OAuth client supplies a client_id URL that CIMDStorageDecorator.GetClient routes through FetchClientMetadataDocument in pkg/oauthproto/cimd/fetch.go; protectedDialerControl in pkg/networking/http_client.go and validateHost in pkg/skills/gitresolver/reference.go share the defective classification but use operator-controlled or user-controlled destinations. On a ToolHive host behind a NAT64/DNS64 gateway, the gateway translates an allowed address such as 64:ff9b:1::a9fe:a9fe to 169.254.169.254, permitting blind probing of internal TCP or TLS reachability. The attacker-controlled CIMD path requires HTTPS, verifies certificates, and does not reflect response bodies, so the established impact is an internal reachability oracle rather than metadata credential exfiltration; the webhook client is not affected because it does not use this IP guard. This issue is fixed in version 0.29.1.","datePublished":"Sep 15, 2026, 3:47:39 PM","dateUpdated":"Sep 15, 2026, 4:13:16 PM","status":"PUBLISHED","baseScore":2.9,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","references":"https://github.com/stacklok/toolhive/security/advisories/GHSA-pph6-vfjv-vpjw\nhttps://github.com/stacklok/toolhive/commit/26912af453d2040787983dbc9ab93a9019ec0468\nhttps://github.com/stacklok/toolhive/releases/tag/v0.29.1\n","enisa_id":"EUVD-2026-78817\n","assigner":"GitHub_M","epss":0.33,"dataProcessed":"Nov 11, 2026, 7:22:01 AM","vulnerabilityProduct":[{"id":"98216f28-0b5a-325a-a368-87b6a376a9a1","product":{"name":"toolhive","vendor":{"name":"stacklok"}},"product_version":"\u003c 0.29.1"}],"vulnerabilityVendor":[{"id":"c9c8aead-c12e-358b-a871-d03f9aa2d505","vendor":{"name":"stacklok"}}]}}],"enisaIdAdvisory":[]}