PoC Index85,092 CVEs with PoCs

CVE-2026-48710

Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks

KEVMEDIUM 6.5EPSS 7.1%

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.

Affected
Kludex · starlette
CVSS v3.1 NVD
6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS
7.06% chance of exploitation in the next 30 days, 94th percentile
CISA KEV
added 2026-09-02
Nuclei
critical · CWE-1289
Published
2026-05-26
Updated
2026-10-01

Proof-of-concept exploits (3)

Nuclei templates (1)

Security advisories

References

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