Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and earlier, StaticFiles on Windows is vulnerable to SSRF. An UNC path such as \\attacker.com\share can cause os.path.realpath to initiate an outbound SMB connection before the path is rejected, exposing the service account’s NTLMv2 credentials for offline cracking or relay even though the HTTP response is only a 404. The issue affects default follow_symlink=False deployments, including frameworks built on Starlette such as FastAPI; POSIX systems and follow_symlink=True are unaffected. The issue is fixed in 1.1.0.
Project Subscriptions
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Advisories
| Source | ID | Title |
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Github GHSA |
GHSA-wqp7-x3pw-xc5r | Starlette: SSRF and NTLM credential theft via UNC paths in StaticFiles on Windows |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 18 Jun 2026 16:45:00 +0000
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threat_severity
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Thu, 18 Jun 2026 04:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and earlier, StaticFiles on Windows is vulnerable to SSRF. An UNC path such as \\attacker.com\share can cause os.path.realpath to initiate an outbound SMB connection before the path is rejected, exposing the service account’s NTLMv2 credentials for offline cracking or relay even though the HTTP response is only a 404. The issue affects default follow_symlink=False deployments, including frameworks built on Starlette such as FastAPI; POSIX systems and follow_symlink=True are unaffected. The issue is fixed in 1.1.0. | |
| Title | Starlette: SSRF and NTLM credential theft via UNC paths in StaticFiles on Windows | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-17T19:31:45.487Z
Reserved: 2026-05-22T20:57:10.976Z
Link: CVE-2026-48818
Updated: 2026-06-17T19:31:37.575Z
No data.
OpenCVE Enrichment
Updated: 2026-06-18T19:30:15Z
Weaknesses
Github GHSA