{"cve":"CVE-2026-67446","nvd":{"published":"2026-08-20T21:17:07.260","modified":"2026-10-18T20:10:00.110","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-400","CWE-770"],"references":["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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-67446","score":0.00507,"percentile":0.42959,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-75mr-qw9x-3r39","url":"https://osv.dev/vulnerability/GHSA-75mr-qw9x-3r39","summary":"Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling","modified":"2026-09-10T15:25:26.186796035Z","packages":[{"ecosystem":"Go","name":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","ranges":["<1.30.4"],"fixed":["1.30.4"]}]},{"id":"GO-2026-6359","url":"https://osv.dev/vulnerability/GO-2026-6359","summary":"Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling in github.com/axllent/mailpit","modified":"2026-09-10T15:15:12.351295661Z","packages":[{"ecosystem":"Go","name":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","ranges":["<1.30.4"],"fixed":["1.30.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}