{
    "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": "2026-08-20T21:10:28.074Z"
    },
    "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"
            }
        }
    }
}