CVE-2026-48710: encode starlette, redhat ai_inference_server, redhat ansible_automation_platform

CVSS 6.5 (medium) · listed as exploited by CISA since 2026-09-02 · published 2026-05-26

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.

Affected products (NVD): 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

Fixed in (NVD): 1.0.1, 8.2.0, 3.3.5, 3.4.2

Weakness: CWE-444, CWE-1289

Source: NVD CVE-2026-48710

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

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.