CVE-2026-48710— Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks
In-the-Wild Activity Observed github_trending · low
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-48710
Vulnerability Information
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Vulnerability Title
Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks
Source: NVD (National Vulnerability Database)
Vulnerability Description
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. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope["server"]` for malformed values.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-48710
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Patches & Fixes for CVE-2026-48710 (1)
Vendor Advisories for CVE-2026-48710 (4)
Security Blog Posts for CVE-2026-48710 (1)
News Coverage for CVE-2026-48710 (1)
IV. Related Vulnerabilities
Same product: starlette
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Starlette Denial of service (DoS) via multipart/form-data - CVE-2023-29159
Starlette 路径遍历漏洞 - CVE-2023-30798
MultipartParser DOS with too many fields or files in Starlet
Same vendor: Kludex
- CVE-2026-42561
Python-Multipart: Denial of Service via unbounded multipart - CVE-2026-40347
Python-Multipart affected by Denial of Service via large mul - CVE-2026-24486
Python-Multipart has Arbitrary File Write via Non-Default Co - CVE-2025-62727
Starlette vulnerable to O(n^2) DoS via Range header merging - CVE-2024-53981
python-multipart has a Denial of service (DoS) via deformati
Same weakness: CWE-444
- CVE-2026-8620
IBM WebSphere Application Server and WebSphere Application S - CVE-2026-42585
Netty: HTTP Request Smuggling due to malformed Transfer-Enco - CVE-2026-42584
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Netty: HTTP Request Smuggling due to incorrect chunk size pa - CVE-2026-42581
Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitiz
V. Comments for CVE-2026-48710
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