CVE-2026-48710（encode starlette）の深刻度・悪用状況・対象バージョン
概要
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.
CISA の要求対応: 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.
影響を受ける製品
| ベンダー | 製品 | 対象バージョン |
|---|---|---|
| encode | starlette | ≥ 0.8.3 かつ < 1.0.1 |
| redhat | ai_inference_server | ≥ 3.3.0 かつ ≤ 3.3.5 |
| redhat | ansible_automation_platform | 2.6 |
| redhat | ansible_automation_platform | 2.7 |
| redhat | migration_toolkit_for_applications | < 8.2.0 |
| redhat | openshift_ai | ≥ 3.3 かつ < 3.3.5 |
| redhat | openshift_ai | ≥ 3.4 かつ < 3.4.2 |
| redhat | openshift_lightspeed | すべて／記載なし |
| redhat | satellite | 6.17 |
| redhat | satellite | 6.18 |
| redhat | satellite | 6.19 |
| redhat | enterprise_linux_ai | 3.0 |
基本情報
- 公開日
- 2026-05-26
- 最終更新
- 2026-10-01
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-444 CWE-1289
対策の進め方
- 上の表で、使っている製品とバージョンが対象か確認します。
- ベンダーの公式アドバイザリ（下の参考情報の「Vendor Advisory」「Patch」）で修正版・回避策を確認します。
- 悪用が確認されているため、パッチ適用までの間もアクセス制限・侵害の痕跡確認を検討します。
- 日本語の情報は JVN iPedia で CVE-2026-48710 を検索 できます。
参考情報
- https://badhost.org MitigationThird 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 MitigationThird Party Advisory
- https://www.secwest.net/starlette ExploitMitigationThird Party Advisory
- https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette ExploitMitigationThird 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
- NVD: CVE-2026-48710
- CVE.org: CVE-2026-48710
データ出典: NIST NVD、CISA KEV、FIRST EPSS。翻訳は参考情報で、正確性は原文を優先してください。