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.
References
Configurations
History
10 Jul 2026, 12:17
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02 Jul 2026, 12:17
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29 Jun 2026, 14:16
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27 Jun 2026, 05:16
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23 Jun 2026, 20:16
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| References | () https://badhost.org - Mitigation, Third Party Advisory | |
| References | () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch | |
| References | () https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr - Vendor Advisory | |
| References | () https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml - Third Party Advisory | |
| References | () https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette - Mitigation, Third Party Advisory | |
| References | () https://www.secwest.net/starlette - Exploit, Mitigation, Third Party Advisory | |
| References | () https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette - Exploit, Mitigation, Third Party Advisory |
16 Jun 2026, 13:16
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| References |
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| References | () https://badhost.org - Mitigation, Third Party Advisory | |
| References | () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch | |
| References | () https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr - Vendor Advisory | |
| References | () https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml - Third Party Advisory | |
| References | () https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette - Mitigation, Third Party Advisory | |
| References | () https://www.secwest.net/starlette - Exploit, Mitigation, Third Party Advisory | |
| References | () https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette - Exploit, Mitigation, Third Party Advisory | |
| CWE | CWE-1289 |
03 Jun 2026, 02:14
| Type | Values Removed | Values Added |
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| CPE | cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:* | |
| First Time |
Encode
Encode starlette |
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| References | () https://badhost.org - Mitigation, Third Party Advisory | |
| References | () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch | |
| References | () https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr - Vendor Advisory | |
| References | () https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml - Third Party Advisory | |
| References | () https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette - Mitigation, Third Party Advisory | |
| References | () https://www.secwest.net/starlette - Exploit, Mitigation, Third Party Advisory | |
| References | () https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette - Exploit, Mitigation, Third Party Advisory |
26 May 2026, 22:16
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| New CVE |
Information
Published : 2026-05-26 22:16
Updated : 2026-07-15 02:22
NVD link : CVE-2026-48710
Mitre link : CVE-2026-48710
CVE.ORG link : CVE-2026-48710
JSON object : View
Products Affected
encode
- starlette
