CVE-2026-48710
medium · 6.5Actively exploitedOn the CISA Known Exploited Vulnerabilities catalog
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.
A public exploit / detection template exists
Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| encode | starlette | >= 0.8.3, < 1.0.1 |
| redhat | ai_inference_server | >= 3.3.0, <= 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, < 3.3.5 |
| redhat | openshift_ai | >= 3.4, < 3.4.2 |
| redhat | openshift_lightspeed | all versions |
| redhat | satellite | 6.17 |
| redhat | satellite | 6.18 |
| redhat | satellite | 6.19 |
| redhat | enterprise_linux_ai | 3.0 |
Check a specific version with /api/v1/cve/match.
References
- https://badhost.org
- https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6
- https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr
- https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml
- https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
- https://www.secwest.net/starlette
- https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette
- https://access.redhat.com/errata/RHSA-2026:22992
- https://access.redhat.com/errata/RHSA-2026:22993
- https://access.redhat.com/errata/RHSA-2026:23346
- https://access.redhat.com/errata/RHSA-2026:24866
- https://access.redhat.com/errata/RHSA-2026:26226
- https://access.redhat.com/errata/RHSA-2026:30088
- https://access.redhat.com/errata/RHSA-2026:30089
- https://access.redhat.com/errata/RHSA-2026:34456
- https://access.redhat.com/errata/RHSA-2026:34526
- https://access.redhat.com/errata/RHSA-2026:34532
- https://access.redhat.com/errata/RHSA-2026:37275
- https://access.redhat.com/errata/RHSA-2026:43038
- https://access.redhat.com/errata/RHSA-2026:44696
- https://access.redhat.com/errata/RHSA-2026:51357
- https://access.redhat.com/errata/RHSA-2026:60520
- https://access.redhat.com/errata/RHSA-2026:63337
- https://access.redhat.com/security/cve/CVE-2026-48710
- https://bugzilla.redhat.com/show_bug.cgi?id=2481742
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-48710