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Advisory record · GHSA-wqp7-x3pw-xc5r

Starlette: SSRF and NTLM credential theft via UNC paths in StaticFiles on Windows

CVSS 7.5 HighEPSS 0.0037 · 31st percentile

Published by the GitHub Advisory Database at 15 Jun 2026, 20:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
starlettePyPI<1.1.01.1.0
Identifiers
GHSA-wqp7-x3pw-xc5r · CVE-2026-48818 · PYSEC-2026-2281
Weakness (CWE)
CWE-918
Tags
Published
15 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Starlette versions before 1.1.0 are vulnerable when serving static files with StaticFiles on Windows in the default configuration. An unauthenticated client can send a UNC path that makes the server open an SMB connection to an attacker-chosen host, leaking the service account's NTLMv2 credentials. Upgrade to Starlette 1.1.0 or later; until then, serve static files through a dedicated web server or block outbound SMB (port 445) from the application host.

Written 4 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 31st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 23 May 2026, 16:58 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:29 UTC First seen by agentprime
  3. 31 Oct 2026, 14:29 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.