rewindex

RewindexCVEs

CVE-2026-48710: Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks

Medium · CVSS 6.5 (CVSS 3.1)KEV known exploitedEPSS 70.3%, 99th percentilePublished Updated Assigner: GitHub_M

In CISA’s Known Exploited Vulnerabilities catalog: Kludex Starlette HTTP Request/Response Smuggling Vulnerability.

Added , federal remediation due . Known ransomware use: Unknown.

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N · CWE-444

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Kludex: starletteRed Hat: Exploit IntelligenceRed Hat: OpenShift LightspeedRed Hat: Red Hat AI Inference ServerRed Hat: Red Hat AI Inference Server 3.3Red Hat: Red Hat Ansible Automation Platform 2Red Hat: Red Hat Ansible Automation Platform 2.6Red Hat: Red Hat Ansible Automation Platform 2.7Red Hat: Red Hat Enterprise Linux AI (RHEL AI) 3Red Hat: Red Hat Migration Toolkit for Applications 8.2Red Hat: Red Hat OpenShift AI 3.3Red Hat: Red Hat OpenShift AI (RHOAI)

References

All CVEsMarkdownJSON