{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-67446","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-29T15:07:24.992Z","datePublished":"2026-08-20T21:10:28.074Z","dateUpdated":"2026-08-21T14:56:09.415Z"},"containers":{"cna":{"title":"Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling","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":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","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:L","version":"3.1"}}],"references":[{"name":"https://github.com/axllent/mailpit/security/advisories/GHSA-75mr-qw9x-3r39","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-75mr-qw9x-3r39"},{"name":"https://github.com/axllent/mailpit/commit/6bcb6337838b542d53c348e38c7977f569b6db35","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/commit/6bcb6337838b542d53c348e38c7977f569b6db35"},{"name":"https://github.com/axllent/mailpit/releases/tag/v1.30.4","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/releases/tag/v1.30.4"}],"affected":[{"vendor":"axllent","product":"mailpit","versions":[{"version":"< 1.30.4","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-20T21:10:28.074Z"},"descriptions":[{"lang":"en","value":"Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit decodes attacker-supplied image attachments into a full raster before checking decoded dimensions, pixel count, or memory use in the GET /api/v1/message/{id}/part/{partID}/thumb endpoint. The Thumbnail handler in server/apiv1/thumbnails.go obtains attachment bytes through storage.GetAttachmentPart(), accepts image/* content, and calls imaging.Decode() with AutoOrientation before imaging.Fill() scales the image to 180 by 120 pixels. A compact image declaring very large dimensions can therefore consume disproportionately large memory and CPU, and opening the message UI can trigger the same endpoint through server/ui-src/components/message/MessageAttachments.vue. This can degrade availability when an unauthenticated client can store the crafted attachment and reach the web API. This issue is fixed in version 1.30.4."}],"source":{"advisory":"GHSA-75mr-qw9x-3r39","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-75mr-qw9x-3r39","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-21T14:56:02.744495Z","id":"CVE-2026-67446","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":"2026-08-21T14:56:09.415Z"}}]}}