CVE-2026-67446

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.

• CWE-400
• CWE-770

• https://github.com/axllent/mailpit/commit/6bcb6337838b542d53c348e38c7977f569b6db35
• https://github.com/axllent/mailpit/releases/tag/v1.30.4
• https://github.com/axllent/mailpit/security/advisories/GHSA-75mr-qw9x-3r39
• https://github.com/axllent/mailpit/security/advisories/GHSA-75mr-qw9x-3r39

Published

Aug 20, 2026

Last Modified

Sep 18, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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