Risk Letters

Exploited vulnerability

CVE-2026-48710

TLP:CLEAR

Kludex Starlette HTTP Request/Response Smuggling Vulnerability

Kludex Starlette contains a HTTP request/response smuggling vulnerability that could allow attackers to inject paths into the host part, prepending the actual path leading to issues such as authentication bypass when the authentication depends on the reconstructed URL’s path. This vulnerability could be chaned with CVE-2026-42271.

Facts

  • Vendor: Kludex
  • Product: Starlette
  • CVSS: 6.5
  • EPSS (probability of exploitation within 30 days): 70.3 %
  • On CISA's Known Exploited Vulnerabilities list since: 2 September 2026
  • First known exploitation: 2 September 2026
  • CISA's deadline for US federal agencies: 16 September 2026
  • Weakness: CWE-444
  • First seen by Risk Letters: 2 September 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD