Kludex Starlette HTTP Request/Response Smuggling Vulnerability

Are you affected?

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• cpe encode/starletteversion unspecified
• cpe redhat/ai inference serverversion unspecified
• cpe redhat/ansible automation platform2.6
• cpe redhat/ansible automation platform2.7
• cpe redhat/migration toolkit for applicationsversion unspecified
• cpe redhat/openshift aiversion unspecified
• cpe redhat/openshift lightspeedversion unspecified
• vendor Kludex Starletteversion unspecified

How to fix CVE-2026-48710

• Recommended remediation

  Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. CISA due date Sep 16, 2026.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com
• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. May 26, 2026 · Catalog

   Detected

   Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP request header was not validated before being used to reconstruct . Because the routing algorithm relies on the raw HTTP path while is rebuilt from the header, a malformed header could make differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on (rather t

2. Sep 2, 2026 · CISA KEV

   Known exploited

   Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating

3. Sep 16, 2026 · CISA KEV

   Remediation due

   Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating

4. Oct 1, 2026 · Catalog

   Updated

   Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP request header was not validated before being used to reconstruct . Because the routing algorithm relies on the raw HTTP path while is rebuilt from the header, a malformed header could make differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on (rather t

5. Oct 1, 2026 · NIST NVD

   Updated

   Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP request header was not validated before being used to reconstruct . Because the routing algorithm relies on the raw HTTP path while is rebuilt from the header, a malformed header could make differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on (rather t

Sources

• CISA KEVConfirmed exploitationCVE-2026-48710

  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.

  cisa.gov
• CVE.orgVulnerability recordCVE-2026-48710

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-48710

  30-day exploitation probability 7.1%

  first.org
• NIST NVDVulnerability recordCVE-2026-48710

  Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP request header was not validated before being used to reconstruct . Because the routing algorithm relies on the raw HTTP path while is rebuilt from the hea

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2026-48710

  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. Thi

  vulncheck.com

References

• Third Party Advisory · access.redhat.com
• Mitigation · badhost.org
• VulnCheck exploitation evidence · euvd.enisa.europa.eu
• Patch · github.com
• CISA note · github.com
• Third Party Advisory · github.com
• CISA note · nvd.nist.gov
• Mitigation · ostif.org
• VulnCheck exploitation evidence · previdian.com
• CISA note · cisa.gov
• CISA note · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · microsoft.com
• Exploit · secwest.net
• VulnCheck exploitation evidence · wiz.io
• Exploit · x41-dsec.de

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.