---
id: CVE-2026-57448
title: 'Blombooru: administrator image-proxy server-side request forgery'
summary: >-
  Blombooru is a self-hosted personal booru for organizing and tagging private
  image collections. Prior to 1.40.0, the administrator-only `GET /proxy-image`
  endpoint, exposed as `/api/booru-import/proxy-image`, accepts a `url` query
  parame…
severity: medium
cvss: 6.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:N'
cvssSource: cna
cwe:
  - CWE-918
vendor: mrblomblo
product: blombooru
affected:
  - blombooru < 1.40.0
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-03T00:06:08.733958Z'
exploitAvailable: true
published: '2026-10-28'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T00:06:30.718Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-57448'
references:
  - url: >-
      https://github.com/mrblomblo/blombooru/security/advisories/GHSA-5c5w-x8jp-fjqw
    label: >-
      https://github.com/mrblomblo/blombooru/security/advisories/GHSA-5c5w-x8jp-fjqw
  - url: >-
      https://github.com/mrblomblo/blombooru/commit/fad91894b421f64cc40d2db29d72cc7a8c94048d
    label: >-
      https://github.com/mrblomblo/blombooru/commit/fad91894b421f64cc40d2db29d72cc7a8c94048d
  - url: 'https://github.com/mrblomblo/blombooru/releases/tag/v1.40.0'
    label: 'https://github.com/mrblomblo/blombooru/releases/tag/v1.40.0'
tags:
  - cve.org
  - exploit-available
epss: 0.00341
epssPercentile: 0.27792
ingestedAt: '2026-10-30T21:09:21.618Z'
---

## Overview

Blombooru is a self-hosted personal booru for organizing and tagging private image collections. Prior to 1.40.0, the administrator-only `GET /proxy-image` endpoint, exposed as `/api/booru-import/proxy-image`, accepts a `url` query parameter and fetches it server-side without meaningful destination validation. `proxy_image()` in `backend/app/routes/booru_import.py` only checks whether the value starts with http, then uses `get_client_for_url` or `requests.get` and streams the response. Private, loopback and link-local addresses are not blocked, and automatically followed redirects can move a request from a trusted domain to an internal address. An authenticated administrator can enumerate internal services and access cloud instance metadata, potentially disclosing IAM credentials and crossing the application's intended cloud or network trust boundary. The reporter also observed a hanging recursive self-request. Administrator authentication remains a prerequisite; this is not an anonymous proxy. This issue is fixed in version 1.40.0.

## Affected

- `blombooru < 1.40.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.