Starlette vulnerabilities
3 known CVE vulnerabilities in Starlette, translated and rated.
- CVE-2026-48818High
A vulnerability in Starlette 1.0.1 and earlier on Windows allows SSRF via UNC paths. When the server validates the path, it sends an SMB request to the attacker, leaking NTLMv2 credentials. The issue affects default follow_symlink=False deployments, including frameworks like FastAPI.
- CVE-2026-48710Medium
Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP Host request header was not validated before being used to reconstruct request.url. Because the routing algorithm relies on the raw HTTP path while request.url is rebuilt from the Host header, a malformed header could make request.url.path differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on request.url (rather than the raw scope path) could therefore be bypassed.
- CVE-2023-30798High
The vulnerability in the Starlette Python framework before version 0.25.0 allows an unauthenticated remote attacker to specify an arbitrary number of form fields or files, causing excessive memory usage and denial of service (DoS) of the HTTP service.