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DEBIAN-CVE-2026-48710

Type: advisorySource: OSVKnown exploited1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-48710

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-48710

starlette

Source reference: /affected/0/package/name

Affected versions
0.26.1-1

Source reference: /affected/0/versions

Fixed versions
0.26.1-1+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

starlette

Source reference: /affected/1/package/name

Affected versions
0.46.1-3

Source reference: /affected/1/versions

0.46.1-3+deb13u1

Source reference: /affected/1/versions

Fixed versions
0.46.1-3+deb13u2

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

starlette

Source reference: /affected/2/package/name

Affected versions
0.46.1-3

Source reference: /affected/2/versions

0.50.0-1

Source reference: /affected/2/versions

1.0.0-1

Source reference: /affected/2/versions

Fixed versions
1.1.0-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.26.1-1+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "starlette",
      "purl": "pkg:deb/debian/starlette?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "0.26.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48710.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.46.1-3+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "starlette",
      "purl": "pkg:deb/debian/starlette?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "0.46.1-3",
      "0.46.1-3+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48710.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.1.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "starlette",
      "purl": "pkg:deb/debian/starlette?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "0.46.1-3",
      "0.50.0-1",
      "1.0.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48710.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]
Related CVEs
CVE-2026-48710

Source reference: /upstream

Publisher severity

medium

Source reference: /severity/0/score

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-48710 · Medium

starlette

CVE-2026-48710 · Unrated

Starlette · Known exploited (CISA KEV)

Event
#67674 · Revision 1
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Publisher date
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