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CVE-2026-48710

CWE-444

High

81.3

RPS

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

Signals

CVSS
6.5
Medium · v3.1
EPSS
7.05%
Probability of exploitation in the next 30 days (FIRST)
CISA KEV
In CISA KEV since Sept 2026
Fix commit
Fix commit known
Sources: MoreFixes, FreshFixes
Weakness
CWE-444
CWE-444, CWE-1289
Published
26 May 2026
Last modified 1 Oct 2026

How to read these signals: RPS · EPSS · CISA KEV · Data sources

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Data as of 7 Oct 2026, 05:16 UK time

CVE-2026-48710 · RPS 81.3 · DevSecure Intelligence