CVE-2026-55187

{"id": "CVE-2026-55187", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55187", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-13T15:55:02.724130Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "axllent", "product": "mailpit", "versions": [{"status": "affected", "version": "< 1.30.2"}]}]}], "published": "2026-07-10T22:16:43.110", "references": [{"url": "https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78", "source": "security-advisories@github.com"}, {"url": "https://github.com/axllent/mailpit/releases/tag/v1.30.2", "source": "security-advisories@github.com"}, {"url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28", "source": "security-advisories@github.com"}, {"url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-918"}]}], "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."}], "lastModified": "2026-07-13T19:21:55.683", "sourceIdentifier": "security-advisories@github.com"}