CVE-2026-48818highCWE-918

CVE-2026-48818: fallo de gravedad alta en Kludex starlette

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

Publicada el · Actualizada el

Seguir esta CVE+ Monitorear starlette+ Monitorear starlette

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

21Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 7.5epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Productos afectados
Kludex · starlette
CVEs relacionadas — Kludex starlette

En el mismo producto, de las más peligrosas a las menos.

CVE-2026-48710MEDIUMStarlette has missing Host header validation that poisons request.url.path, bypassing path-based security checksEPSS 70.3%KEVCVE-2025-62727HIGHStarlette vulnerable to O(n^2) DoS via Range header merging in starlette.responses.FileResponseEPSS 0.8%CVE-2026-54283HIGHStarlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoSEPSS 0.5%CVE-2026-54282LOWStarlette: Unvalidated request path concatenated into authority poisons request.url.hostnameEPSS 0.3%CVE-2026-48817MEDIUMStarlette: Arbitrary HTTP method dispatched to `HTTPEndpoint` attributes via `getattr`EPSS 0.2%