7.5

CVE-2026-48818

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Encode ≫ Starlette SwPlatformpython Version < 1.1.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.37% 0.286
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-918 Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

https://github.com/Kludex/starlette/security/advisories/GHSA-wqp7-x3pw-xc5r
Vendor Advisory
Mitigation
https://github.com/Kludex/starlette/pull/3287
Patch
https://github.com/Kludex/starlette/commit/fd53168a7767b6b55ba5af787fd88f49e33cabc5
Patch
https://github.com/Kludex/starlette/releases/tag/1.1.0
Release Notes
https://access.redhat.com/errata/RHSA-2026:30087
https://access.redhat.com/errata/RHSA-2026:30088
https://access.redhat.com/errata/RHSA-2026:30089
https://access.redhat.com/security/cve/CVE-2026-48818
https://bugzilla.redhat.com/show_bug.cgi?id=2490020
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48818.json