FKIE_CVE-2026-48710

Vulnerability from fkie_nvd - Published: 2026-05-26 22:16 - Updated: 2026-10-01 18:17
Summary
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
security-advisories@github.comhttps://badhost.orgMitigation, Third Party Advisory
security-advisories@github.comhttps://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6Patch
security-advisories@github.comhttps://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mrVendor Advisory
security-advisories@github.comhttps://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yamlThird Party Advisory
security-advisories@github.comhttps://ostif.org/disclosing-the-badhost-vulnerability-in-starletteMitigation, Third Party Advisory
security-advisories@github.comhttps://www.secwest.net/starletteExploit, Mitigation, Third Party Advisory
security-advisories@github.comhttps://www.x41-dsec.de/lab/advisories/x41-2026-002-starletteExploit, Mitigation, Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22992Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22993Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:23346Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:24866Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26226Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30088Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30089Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34456Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34526Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34532Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:37275Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:43038Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:44696Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:51357Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:60520Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:63337Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-48710Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2481742Issue Tracking, Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48710.jsonThird Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48710Third Party Advisory, US Government Resource
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.wiz.io/blog/ai-infrastructure-honeypotExploit, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https:/www.microsoft.com/en-us/security/blog/2026/08/26/when-ai-infrastructure-becomes-target-securing-gateways-control-pointsBroken Link

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              "matchCriteriaId": "C34B05C8-C19C-497F-8E1D-8F6039CDB185",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:redhat:satellite:6.17:*:*:*:*:*:*:*",
              "matchCriteriaId": "342183ED-1495-4481-9164-B3ED8424B618",
              "vulnerable": true
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            {
              "criteria": "cpe:2.3:a:redhat:satellite:6.18:*:*:*:*:*:*:*",
              "matchCriteriaId": "C2205338-7476-46DC-ABB2-52F0BBAAD01D",
              "vulnerable": true
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              "matchCriteriaId": "BCFB23DD-F6A0-4CDB-98E8-E072C104ED4B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:redhat:enterprise_linux_ai:3.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "531FF57A-65AE-482C-9A43-D1F2ECAD6ED0",
              "vulnerable": true
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          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 \u00a73.2 / RFC 3986 \u00a73.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values."
    },
    {
      "lang": "es",
      "value": "Starlette es un framework/kit de herramientas ASGI ligero. Antes de la versi\u00f3n 1.0.1, el encabezado de solicitud HTTP \u0027Host\u0027 no se validaba antes de ser utilizado para reconstruir \u0027request.url\u0027. Debido a que el algoritmo de enrutamiento se basa en la ruta HTTP sin procesar mientras que \u0027request.url\u0027 se reconstruye a partir del encabezado \u0027Host\u0027, un encabezado malformado podr\u00eda hacer que \u0027request.url.path\u0027 difiera de la ruta que fue realmente solicitada. El middleware y los puntos finales que aplican restricciones de seguridad basadas en \u0027request.url\u0027 (en lugar de la ruta \u0027scope\u0027 sin procesar) podr\u00edan, por lo tanto, ser eludidos. Los usuarios deber\u00edan actualizar a una versi\u00f3n mayor o igual a la versi\u00f3n 1.0.1, que valida el encabezado \u0027Host\u0027 contra la gram\u00e1tica de RFC 9112 \u00a73.2 / RFC 3986 \u00a73.2.2 al construir \u0027request.url\u0027 y recurre a \u0027scope[\"server\"]\u0027 para valores malformados."
    }
  ],
  "id": "CVE-2026-48710",
  "lastModified": "2026-10-01T18:17:18.153",
  "metrics": {
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          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
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          "role": "CISA Coordinator",
          "timestamp": "2026-09-03T03:56:07.799548Z",
          "version": "2.0.3"
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  "published": "2026-05-26T22:16:44.020",
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      "url": "https://badhost.org"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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