{"apiVersion":"1.0","identifier":"CVE-2026-67446","description":"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.","publishedAt":"2026-08-20T21:17:07","lastModifiedAt":"2026-08-21T15:16:46","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67446","cvssScore":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","epssProbability":0.00371,"riskScore":0.55,"affectedProduct":"Mailpit","affectedVersions":"<1.30.4","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-67446","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-67446","en":"https://www.redsauce.net/en/cves/CVE-2026-67446","fr":"https://www.redsauce.net/fr/cves/CVE-2026-67446","pt":"https://www.redsauce.net/pt/cves/CVE-2026-67446","de":"https://www.redsauce.net/de/cves/CVE-2026-67446","sk":"https://www.redsauce.net/sk/cves/CVE-2026-67446","el":"https://www.redsauce.net/el/cves/CVE-2026-67446"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-67446"}}