{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45713", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-13T05:51:48.665Z", "datePublished": "2026-07-20T15:01:01.489Z", "dateUpdated": "2026-07-20T16:16:44.713Z"}, "containers": {"cna": {"title": "Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/send body sizes", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw"}, {"name": "https://github.com/axllent/mailpit/releases/tag/v1.30.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.0"}], "affected": [{"vendor": "axllent", "product": "mailpit", "versions": [{"version": "< 1.30.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-20T15:01:01.489Z"}, "descriptions": [{"lang": "en", "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit SMTP server has a Server.MaxSize int field that controls the maximum allowed DATA payload size, but the field is never assigned anywhere outside test code, leaving it at Go's zero value (0 \u21d2 \"no limit\"). The same applies to the HTTP /api/v1/send endpoint, whose request body is decoded with json.NewDecoder(r.Body) and no http.MaxBytesReader. Because Mailpit's default listeners bind [::]:1025 (SMTP) and [::]:8025 (HTTP), with no authentication required on either, a single network-reachable attacker can push an arbitrarily large message into Mailpit and watch RAM consumption spike with a ~7-10\u00d7 amplification factor (raw frame \u2192 enmime envelope tree \u2192 search-text index \u2192 zstd-encoded write to SQLite). Repeating the attack \u2014 or running it concurrently from multiple connections \u2014 drives the process to OOM-kill. Version 1.30.0 contains a patch."}], "source": {"advisory": "GHSA-fpxj-m5q8-fphw", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-20T16:16:33.595846Z", "id": "CVE-2026-45713", "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": "2026-07-20T16:16:44.713Z"}}]}}

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