6.5

CVE-2026-48710

Medienbericht
Exploit

Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Encode ≫ Starlette SwPlatformpython Version >= 0.8.3 < 1.0.1
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.44% 0.698
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 6.5 3.9 2.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
security-advisories@github.com 6.5 3.9 2.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 6.5 3.9 2.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE-1289 Improper Validation of Unsafe Equivalence in Input

The product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value.

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

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VulnDex Intel
Media Report
09.06.2026 08:41
https://badhost.org
Third Party Advisory
Mitigation
https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6
Patch
https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr
Vendor Advisory
https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml
Third Party Advisory
https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
Third Party Advisory
Mitigation
https://www.secwest.net/starlette
Third Party Advisory
Exploit
Mitigation
https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette
Third Party Advisory
Exploit
Mitigation
https://access.redhat.com/security/cve/CVE-2026-48710
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48710.json
https://bugzilla.redhat.com/show_bug.cgi?id=2481742
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
https://access.redhat.com/errata/RHSA-2026:30088
https://access.redhat.com/errata/RHSA-2026:30089
https://access.redhat.com/errata/RHSA-2026:34456
https://access.redhat.com/errata/RHSA-2026:34526
https://access.redhat.com/errata/RHSA-2026:34532