CVE-2026-48710

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.
Configurations

Configuration 1 (hide)

cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:*

History

21 Jul 2026, 19:10

Type Values Removed Values Added
Summary
  • (es) Starlette es un framework/kit de herramientas ASGI ligero. Antes de la versión 1.0.1, el encabezado de solicitud HTTP 'Host' no se validaba antes de ser utilizado para reconstruir 'request.url'. Debido a que el algoritmo de enrutamiento se basa en la ruta HTTP sin procesar mientras que 'request.url' se reconstruye a partir del encabezado 'Host', un encabezado malformado podría hacer que 'request.url.path' difiera de la ruta que fue realmente solicitada. El middleware y los puntos finales que aplican restricciones de seguridad basadas en 'request.url' (en lugar de la ruta 'scope' sin procesar) podrían, por lo tanto, ser eludidos. Los usuarios deberían actualizar a una versión mayor o igual a la versión 1.0.1, que valida el encabezado 'Host' contra la gramática de RFC 9112 §3.2 / RFC 3986 §3.2.2 al construir 'request.url' y recurre a 'scope["server"]' para valores malformados.

10 Jul 2026, 12:17

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:37275 -

02 Jul 2026, 12:17

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:34456 -
  • () https://access.redhat.com/errata/RHSA-2026:34526 -
  • () https://access.redhat.com/errata/RHSA-2026:34532 -

29 Jun 2026, 14:16

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:30088 -
  • () https://access.redhat.com/errata/RHSA-2026:30089 -

27 Jun 2026, 05:16

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:22992 -
  • () https://access.redhat.com/errata/RHSA-2026:22993 -
  • () https://access.redhat.com/errata/RHSA-2026:23346 -
  • () https://access.redhat.com/errata/RHSA-2026:24866 -
  • () https://access.redhat.com/errata/RHSA-2026:26226 -

23 Jun 2026, 20:16

Type Values Removed Values Added
References
  • {'url': 'https://www.cve.org/CVERecord?id=CVE-2026-48710', 'source': '0b0ca135-0b70-47e7-9f44-1890c2a1c46c'}
  • () https://bugzilla.redhat.com/show_bug.cgi?id=2481742 -
References () https://badhost.org - Mitigation, Third Party Advisory () https://badhost.org - Mitigation, Third Party Advisory
References () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch
References () https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr - Vendor Advisory () 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 () 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 () https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette - Mitigation, Third Party Advisory
References () https://www.secwest.net/starlette - Exploit, Mitigation, Third Party Advisory () 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 () https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette - Exploit, Mitigation, Third Party Advisory

16 Jun 2026, 13:16

Type Values Removed Values Added
References
  • () https://access.redhat.com/security/cve/CVE-2026-48710 -
  • () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48710.json -
  • () https://www.cve.org/CVERecord?id=CVE-2026-48710 -
References () https://badhost.org - Mitigation, Third Party Advisory () https://badhost.org - Mitigation, Third Party Advisory
References () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch
References () https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr - Vendor Advisory () 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 () 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 () https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette - Mitigation, Third Party Advisory
References () https://www.secwest.net/starlette - Exploit, Mitigation, Third Party Advisory () 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 () 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
References () https://badhost.org - () https://badhost.org - Mitigation, Third Party Advisory
References () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - () https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6 - Patch
References () https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr - () 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 - () 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 - () https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette - Mitigation, Third Party Advisory
References () https://www.secwest.net/starlette - () https://www.secwest.net/starlette - Exploit, Mitigation, Third Party Advisory
References () https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette - () https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette - Exploit, Mitigation, Third Party Advisory
CPE cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:*
First Time Encode
Encode starlette

26 May 2026, 22:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-05-26 22:16

Updated : 2026-07-21 19:10


NVD link : CVE-2026-48710

Mitre link : CVE-2026-48710

CVE.ORG link : CVE-2026-48710


JSON object : View

Products Affected

encode

  • starlette
CWE
CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CWE-1289

Improper Validation of Unsafe Equivalence in Input