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TI-2026-36087 Aliases CVE-2026-48818GHSA-wqp7-x3pw-xc5r

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

Priority LOW 39CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00368 30th percentileScored 2026-11-07
Fix Fixed starlette (Kludex): 1.1.0starlette (PyPI): 1.1.0Red Hat: 3 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Kludexstarlettebefore 1.1.01.1.0Patch availableCNA
—starlette (PyPI)before 1.1.01.1.0Patch availableGHSA-wqp7-x3pw-xc5r
  • starlette VendorKludex Affected before 1.1.0 Fixed in 1.1.0 Patch available CNA
  • starlette (PyPI) Vendor— Affected before 1.1.0 Fixed in 1.1.0 Patch available GHSA-wqp7-x3pw-xc5r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:*before 1.1.0Vulnerableencode
  • cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:* Versions before 1.1.0 Vulnerable ·encode

Remediation

  • Fix · CNA starlette (Kludex) Fixed in 1.1.0
  • Fix · GHSA-wqp7-x3pw-xc5r starlette (PyPI) Fixed in 1.1.0 Advisory →

Red Hat 3 advisories

  • RHSA-2026:30089 Released 2026-06-25 · Red Hat rating Critical
    Red Hat AI Inference Server 3.3.5 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-cuda-rhel9
  • RHSA-2026:30088 Released 2026-06-25 · Red Hat rating Critical
    Red Hat AI Inference Server 3.3.5 (ROCm)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-rocm-rhel9
  • RHSA-2026:30087 Released 2026-06-25 · Red Hat rating Critical
    Red Hat AI Inference Server 3.3.5 (Spyre)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-spyre-rhel9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat AI Inference Server 3.3Fixed RHSA-2026:30087, RHSA-2026:30088, RHSA-2026:30089
Not affected: 9 products
  • Exploit Intelligence
  • Migration Toolkit for Applications 8
  • OpenShift Lightspeed
  • Red Hat AI Inference Server
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Hardened Images
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat Satellite 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48818
  2. 2026-10-03 Alias added: GHSA-wqp7-x3pw-xc5r
  3. 2026-10-18 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile
  5. 2026-10-25 Priority changed: MEDIUM → LOW

References

Patch 2

Advisory 1

Other 3

  • TI-2025-38917 Starlette vulnerable to O(n^2) DoS via Range header merging in starlette.responses.FileResponse CVSS 3.1HIGH 7.5
  • TI-2026-30841 Python-Multipart: Denial of Service via unbounded multipart part headers CVSS 3.1HIGH 7.5
  • TI-2024-36140 python-multipart has a Denial of service (DoS) via deformation `multipart/form-data` boundary CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences