CVE-2026-48818— Starlette: SSRF and NTLM credential theft via UNC paths in StaticFiles on Windows
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I. Basic Information for CVE-2026-48818
Vulnerability Information
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Vulnerability Title
Starlette: SSRF and NTLM credential theft via UNC paths in StaticFiles on Windows
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Kludex starlette 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kludex starlette是Kludex的Web框架。 Kludex starlette 1.0.1及之前版本存在服务端请求伪造漏洞，该漏洞源于Windows上StaticFiles容易受到SSRF攻击，UNC路径可能导致发起出站SMB连接，暴露服务账户的NTLMv2凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-48818
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Patches & Fixes for CVE-2026-48818 (2)
Vendor Advisories for CVE-2026-48818 (1)
Vendor Pages for CVE-2026-48818 (1)
- 🔗 Release Version 1.1.0 · Kludex/starlette · GitHubx_refsource_MISC
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