{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55187","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-16T15:20:43.086Z","datePublished":"2026-07-10T21:43:59.548Z","dateUpdated":"2026-07-13T15:55:15.065Z"},"containers":{"cna":{"title":"Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms (follow-up to CVE-2026-27808)","problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28"},{"name":"https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78"},{"name":"https://github.com/axllent/mailpit/releases/tag/v1.30.2","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/releases/tag/v1.30.2"}],"affected":[{"vendor":"axllent","product":"mailpit","versions":[{"version":"< 1.30.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-10T21:43:59.548Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-w4mc-hhc6-xp28","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-13T15:55:02.724130Z","id":"CVE-2026-55187","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-13T15:55:15.065Z"}}]}}