CVE-2026-57448

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/mrblomblo/blombooru/commit/fad91894b421f64cc40d2db29d72cc7a8c94048d
https://github.com/mrblomblo/blombooru/releases/tag/v1.40.0
https://github.com/mrblomblo/blombooru/security/advisories/GHSA-5c5w-x8jp-fjqw

Configurations

No configuration.

History

28 Oct 2026, 22:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-28 22:17

Updated : 2026-10-29 16:21

NVD link : CVE-2026-57448

Mitre link : CVE-2026-57448

CVE.ORG link : CVE-2026-57448

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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