{ "id": "CVE-2026-48710", "url": "https://spydr.io/cve/CVE-2026-48710", "published": "2026-05-26T22:16:44.020Z", "modified": "2026-10-01T18:17:18.153Z", "score": 6.5, "severity": "medium", "cvss_version": "3.1", "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "score_source": "NVD", "epss": 0.07056, "epss_percentile": 0.9402, "exploited": true, "kev": { "added": "2026-09-02", "due": "2026-09-16", "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.", "ransomware": "Unknown", "name": "Kludex Starlette HTTP Request/Response Smuggling Vulnerability", "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-48710" }, "ssvc_exploitation": "active", "vendors": [ "Kludex", "Red Hat" ], "products": [ "Kludex starlette", "Red Hat AI Inference Server 3.3", "Red Hat Ansible Automation Platform 2.6", "Red Hat Ansible Automation Platform 2.7", "Red Hat Migration Toolkit for Applications 8.2", "Red Hat OpenShift AI 3.3", "Red Hat OpenShift AI 3.4", "Red Hat Satellite 6.17", "Red Hat Satellite 6.18", "Red Hat Satellite 6.19", "Red Hat Exploit Intelligence", "Red Hat OpenShift Lightspeed", "Red Hat AI Inference Server", "Red Hat Ansible Automation Platform 2", "Red Hat Enterprise Linux AI (RHEL AI) 3", "Red Hat OpenShift AI (RHOAI)" ], "cwes": [ "CWE-444", "CWE-1289" ], "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.", "status": "Analyzed", "score_type": "Primary", "scores": { "cvss_v40": null, "cvss_v31": 6.5, "cvss_v30": null }, "references": [ { "url": "https://badhost.org/", "tags": [ "Mitigation", "Third Party Advisory" ] }, { "url": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6", "tags": [ "Patch" ] }, { "url": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr", "tags": [ "Vendor Advisory" ] }, { "url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml", "tags": [ "Third Party Advisory" ] }, { "url": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette", "tags": [ "Mitigation", "Third Party Advisory" ] }, { "url": "https://www.secwest.net/starlette", "tags": [ "Exploit", "Mitigation", "Third Party Advisory" ] }, { "url": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette", "tags": [ "Exploit", "Mitigation", "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:22992", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:22993", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:23346", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:24866", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:26226", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:30088", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:30089", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:34456", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:34526", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:34532", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:37275", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:43038", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:44696", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:51357", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:60520", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:63337", "tags": [ "Third Party Advisory" ] }, { "url": "https://access.redhat.com/security/cve/CVE-2026-48710", "tags": [ "Third Party Advisory" ] }, { "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481742", "tags": [ "Issue Tracking", "Third Party Advisory" ] } ], "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48710", "covered_in": [], "attribution": [ { "source": "NVD", "url": "https://nvd.nist.gov", "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD." }, { "source": "CISA KEV", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "notice": "Known exploited vulnerabilities from the CISA KEV catalog." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss", "notice": "Exploit prediction scores from FIRST EPSS." } ] }