CVE-2026-48818

HIGH EPSS 19.4%
Published Jun 17, 20262w ago · Modified Jun 22, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jun 17, 2026 2w ago
Last Modified Jun 22, 2026 1w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
19.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-918 Server-Side Request Forgery (SSRF) Validation

References 4

  • github.com https://github.com/Kludex/starlette/commit/fd53168a7767b6b55ba5af787fd88f49e33cabc5
  • github.com https://github.com/Kludex/starlette/pull/3287
  • github.com https://github.com/Kludex/starlette/releases/tag/1.1.0
  • github.com https://github.com/Kludex/starlette/security/advisories/GHSA-wqp7-x3pw-xc5r

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.