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CVE-2026-48818— Starlette: SSRF and NTLM credential theft via UNC paths in StaticFiles on Windows

Quick assessment

Affected
Kludex starlette
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.5 · High EPSS 0.65% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
Kludex starlette < 1.1.0 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Kludex starlette < 1.1.0 -

II. Public POCs for CVE-2026-48818

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10983 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-48818

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Patches & Fixes for CVE-2026-48818 (2)

Vendor Advisories for CVE-2026-48818 (2)

Vendor Pages for CVE-2026-48818 (1)

IV. Related Vulnerabilities

Same product: starlette
Same vendor: Kludex
Same weakness: CWE-918

V. Comments for CVE-2026-48818

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