Threat Intelligence / CVE / CVE-2026-48710

CVE-2026-48710 — Kludex starlette

CVSS v3.1 6.5 (MEDIUM) · EPSS 0.0% (higher than 10.6% of all scored CVEs) · Priority 3.7/10 · Published 2026-05-26

As of 2026-05-27, CVE-2026-48710 is a MEDIUM-severity vulnerability in Kludex starlette, CVSS v3.1 6.5, EPSS 0.0% (10.6th percentile). Threadlinqs Intelligence links 4 tracked threat campaigns to CVE-2026-48710, most recently “Qilin-Linked Campaign Exploits MCP Gateway and LLM Framework Flaws (CVE-2026-59822, CVE-2026-42271, CVE-2026-48710) for RCE and Cryptomining”.

Last updated: 2026-05-27

What is CVE-2026-48710?

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.

The record classifies CVE-2026-48710 under weakness class CWE-444. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 110 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 6.5 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS (FIRST): 0.0% probability of exploitation in the next 30 days, higher than 10.6% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-05-26, last modified 2026-05-27

Is CVE-2026-48710 being exploited?

It currently carries a trending score of 10 in the Threadlinqs vulnerability feed.

Affected products and versions

Kludex: starlette

How to fix CVE-2026-48710

No vendor patch reference has been recorded for CVE-2026-48710 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-48710

4 tracked threats in the Threadlinqs corpus reference CVE-2026-48710, either in the campaign’s CVE list or as an indicator on the campaign record.

Qilin-Linked Campaign Exploits MCP Gateway and LLM Framework Flaws (CVE-2026-59822, CVE-2026-42271, CVE-2026-48710) for RCE and Cryptomining — CRITICAL · 2026-08-28
CVE-2026-42271: LiteLLM AI Gateway OS Command Injection via MCP Test Endpoints, Chained to Unauthenticated RCE with CVE-2026-48710 (CISA KEV, Active Exploitation) — CRITICAL · 2026-06-09
CVE-2026-42271: LiteLLM MCP Server Command Injection Under Active Exploitation, Chained with CVE-2026-48710 (Starlette BadHost) for Unauthenticated RCE — CRITICAL · 2026-06-09
BadHost CVE-2026-48710 — Starlette HTTP Host Header Authentication Bypass Affecting FastAPI/AI Infrastructure (MCP, vLLM, LiteLLM) — CRITICAL · 2026-05-27

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-48710 are available via the Threadlinqs MCP server (Purple tier). View plans →

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