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.
References
Link Resource
https://badhost.org Mitigation Third Party Advisory
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 Mitigation Third Party Advisory
https://www.secwest.net/starlette Exploit Mitigation Third Party Advisory
https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette Exploit Mitigation Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:22992 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:22993 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23346 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:24866 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:26226 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30088 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30089 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:34456 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:34526 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:34532 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:37275 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:43038 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:44696 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:51357 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:60520 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:63337 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-48710 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2481742 Issue Tracking Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48710.json Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48710 Third Party Advisory US Government Resource
https://www.wiz.io/blog/ai-infrastructure-honeypot Exploit Third Party Advisory
https:/www.microsoft.com/en-us/security/blog/2026/08/26/when-ai-infrastructure-becomes-target-securing-gateways-control-points Broken Link
Configurations

Configuration 1 (hide)

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

Configuration 2 (hide)

OR cpe:2.3:a:redhat:ai_inference_server:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:ansible_automation_platform:2.6:-:*:*:*:*:*:*
cpe:2.3:a:redhat:ansible_automation_platform:2.7:-:*:*:*:*:*:*
cpe:2.3:a:redhat:migration_toolkit_for_applications:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_ai:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_ai:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_lightspeed:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:satellite:6.17:*:*:*:*:*:*:*
cpe:2.3:a:redhat:satellite:6.18:*:*:*:*:*:*:*
cpe:2.3:a:redhat:satellite:6.19:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_ai:3.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-26 22:16

Updated : 2026-09-04 15:59


NVD link : CVE-2026-48710

Mitre link : CVE-2026-48710

CVE.ORG link : CVE-2026-48710


JSON object : View

Products Affected

encode

  • starlette

redhat

  • ai_inference_server
  • openshift_ai
  • enterprise_linux_ai
  • ansible_automation_platform
  • openshift_lightspeed
  • migration_toolkit_for_applications
  • satellite
CWE
CWE-444

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

CWE-1289

Improper Validation of Unsafe Equivalence in Input