FKIE_CVE-2026-48710

Vulnerability from fkie_nvd - Published: 2026-05-26 22:16 - Updated: 2026-06-29 14:16
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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-2026:22992
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22993
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:23346
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:24866
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26226
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30088
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30089
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-48710
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2481742
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48710.json
Impacted products
Vendor Product Version
encode starlette *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "starlette",
          "vendor": "Kludex",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:/a:redhat:ai_inference_server:3.3::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat AI Inference Server 3.3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2.6::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Ansible Automation Platform 2.6",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2.7::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Ansible Automation Platform 2.7",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:satellite:6.18::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Satellite 6.18",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:satellite:6.19::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Satellite 6.19",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:exploit_intelligence:0"
          ],
          "defaultStatus": "affected",
          "product": "Exploit Intelligence",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:migration_toolkit_applications:8"
          ],
          "defaultStatus": "affected",
          "product": "Migration Toolkit for Applications 8",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_lightspeed"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift Lightspeed",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:ai_inference_server:3"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat AI Inference Server",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux_ai:3"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AI (RHEL AI) 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_ai"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift AI (RHOAI)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:satellite:6"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Satellite 6",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat Ansible Automation Platform 2",
          "vendor": "Red Hat"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "4C7C6045-86A6-4FAC-AE15-B12438E9D1B4",
              "versionEndExcluding": "1.0.1",
              "versionStartIncluding": "0.8.3",
              "vulnerable": true
            }
          ],
          "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."
    }
  ],
  "id": "CVE-2026-48710",
  "lastModified": "2026-06-29T14:16:53.920",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-48710",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-27T14:22:19.241769Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-26T22:16:44.020",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://badhost.org"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
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      ],
      "url": "https://www.secwest.net/starlette"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette"
    },
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    {
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  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-444"
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      "source": "security-advisories@github.com",
      "type": "Secondary"
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      "type": "Secondary"
    }
  ]
}


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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

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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.


Detection rules are retrieved from Rulezet.