{"id":"CVE-2026-55187","revision":"d22d9736942543a980647629e847ea39","records":[{"revision":"d22d9736942543a980647629e847ea39","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55187","aliases":[],"title":"Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms (follow-up to CVE-2026-27808)","description":"Mailpit is an email testing tool and API for developers. Prior to 1.30.2, the remediation shipped for CVE-2026-27808 is incomplete because the tools.IsInternalIP deny-list in internal/tools/net.go relies on Go's standard library classification helpers and does not block IPv6 transition mechanisms or prefixes such as NAT64, 6to4, IPv4-compatible IPv6, ISATAP, fec0::/10, and 2001:db8::/32. An attacker who can deliver email and invoke POST /api/v1/message/{ID}/link-check can coerce the Link Check API's safeDialContext path into dialing internal destinations and can use status-code and error feedback to map internal service reachability, including cloud metadata endpoints. This issue is fixed in version 1.30.2.","state":0,"publishedAt":"2026-07-10T21:43:59.548+00:00","modifiedAt":"2026-07-13T15:55:15.065+00:00","affected":[{"ecosystem":"Vendor product","name":"mailpit","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"axllent\",\n                    \"product\": \"mailpit\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.30.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","score":5.8,"severity":"MEDIUM"}],"references":["https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28","https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78","https://github.com/axllent/mailpit/releases/tag/v1.30.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55187","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55187","identifiers":["CVE-2026-55187"]},"retained":false,"historicalAffected":[]}],"coverage":[]}