Exploitation active confirmée

Ajoutée au catalogue CISA KEV le 02/09/2026, correctif exigé avant le 16/09/2026 pour les agences fédérales américaines.

Action requise : 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 officielle (NVD)

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.

Preuves de concept publiques (5)

Dépôts tiers non vérifiés, parfois piégés. Ne les exécutez jamais en production : uniquement dans un environnement de test isolé.

eris-ths/supply-chain-guard · ★ 3 · 01/04/2026
Detect, assess, and respond to supply chain attacks across npm/yarn and Python (pip/poetry/uv). Claude Code skill + standalone scripts. Built during axios RAT (2026-03-31) and Starlette BadHost CVE-20
xtremebeing/starlette-host-header-lab · ★ 1 · 27/05/2026
Starlette Host-Header URL Confusion Lab (X41-2026-002) - CVE-2026-48710
Bhanunamikaze/BadHost-CVE-2026-48710-Exploit · ★ 1 · 28/05/2026
Detection scanner for CVE-2026-48710 - Host-header auth bypass in Starlette/FastAPI
sb-ox/repro-OXDEV-77637-uv-workspace · ★ 0 · 03/08/2026
OXDEV-77637 repro fixture: uv workspace whose transitive CVE (starlette 0.25.0 / CVE-2026-48710) is dropped when the lean clone omits workspace-member pyproject.toml. Tag: repro-OXDEV-77637
CuteeCat/CVE-2026-48710 · ★ 0 · 11/08/2026
CVE-2026-48710漏洞验证代码

Références

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

En bref

Éditeur	Kludex
Produit	Starlette
Publiée le	26/05/2026
Modifiée le	01/10/2026
CVSS	6.5 (v3.1)
EPSS	7,06 % (centile 94)
CWE	CWE-444, CWE-1289

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS : probabilité estimée d'exploitation dans les 30 prochains jours.

Produits concernés

encode · starlette redhat · ai_inference_server redhat · ansible_automation_platform redhat · migration_toolkit_for_applications redhat · openshift_ai redhat · openshift_lightspeed redhat · satellite redhat · enterprise_linux_ai

Sources officielles

NVD (NIST) CVE.org CISA KEV

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CVE-2026-48710