CVE-2026-67446— Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-67446
Vulnerability Information
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Vulnerability Title
Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-67446
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Patches & Fixes for CVE-2026-67446 (1)
Vendor Advisories for CVE-2026-67446 (1)
Vendor Pages for CVE-2026-67446 (1)
- 🔗 Release v1.30.4 · axllent/mailpit · GitHubx_refsource_MISC
Same Patch Batch · axllent · 2026-08-20 · 4 CVEs total
| CVE-2026-67448 | 6.5 MEDIUM | Mailpit: WebSocket origin check bypass via percent-encoded path (regression of CVE-2026-22 |
| CVE-2026-67445 | 5.3 MEDIUM | Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection |
| CVE-2026-67447 | 5.3 MEDIUM | Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement |
IV. Related Vulnerabilities
Same product: mailpit
- CVE-2026-67448
Mailpit: WebSocket origin check bypass via percent-encoded p - CVE-2026-67447
Mailpit: SMTP DATA line reader buffers over-limit input befo - CVE-2026-67445
Mailpit: SMTP command parser buffers unbounded command lines - CVE-2026-48824
Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounde - CVE-2026-45713
Mailpit: Unauthenticated remote memory-exhaustion DoS via un
Same vendor: axllent
- CVE-2026-67448
Mailpit: WebSocket origin check bypass via percent-encoded p - CVE-2026-67447
Mailpit: SMTP DATA line reader buffers over-limit input befo - CVE-2026-67445
Mailpit: SMTP command parser buffers unbounded command lines - CVE-2026-48824
Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounde - CVE-2026-45713
Mailpit: Unauthenticated remote memory-exhaustion DoS via un
Same weakness: CWE-400
- CVE-2026-53531
ratex-parser has unbounded parser recursion that leads to st - CVE-2026-77354
kin-openapi: Uncontrolled resource consumption in openapi3fi - CVE-2026-55241
Checkmate: Pre-auth Denial of Service via File Upload on Reg - CVE-2026-77755
Denial of Service in MISP-STIX Import via Malformed or Overs - CVE-2026-19446
Vulnerabilities in IBM AIX and PowerVM VIOS
V. Comments for CVE-2026-67446
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