Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') Affecting starlette package, versions [,1.1.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-STARLETTE-17342514
- published16 Jun 2026
- disclosed15 Jun 2026
- creditUnknown
Introduced: 15 Jun 2026
CVE-2026-48817 (opens in a new tab)How to fix?
Upgrade starlette to version 1.1.0 or higher.
Overview
starlette is a The little ASGI library that shines.
Affected versions of this package are vulnerable to Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') when dispatching HTTP requests to endpoint attributes via getattr. An attacker can invoke internal methods not intended as HTTP handlers by sending requests with non-standard HTTP methods whose names match internal attribute names, potentially bypassing authorization checks.
Note: This is only exploitable if an HTTPEndpoint subclass is registered through Route(...) without specifying the methods= argument and the subclass defines additional methods matching non-standard HTTP-method token shapes that accept a single request argument and return a response.
Workaround
This vulnerability can be mitigated by registering HTTPEndpoint subclasses with an explicit methods= argument on the Route, listing only the supported HTTP verbs.