Server-side Request Forgery (SSRF) 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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- published16 Jun 2026
- disclosed15 Jun 2026
- creditnvn1729
Introduced: 15 Jun 2026
CVE-2026-48818 (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 Server-side Request Forgery (SSRF) in the StaticFiles file on Windows systems when handling UNC paths. An attacker can obtain NTLMv2 credentials of the service account by sending a specially crafted request that causes the server to initiate an outbound SMB connection to an attacker-controlled host, resulting in credential disclosure.
Note: This is only exploitable if the application is running on Windows and serving static files using the default configuration (follow_symlink=False).
Workaround
This vulnerability can be mitigated by serving static files through a dedicated web server (such as nginx or IIS) or by blocking outbound SMB (port 445) from the application host.