Exploited vulnerability CISA KEV
CVE-2026-48710: Kludex Starlette HTTP Request/Response Smuggling Vulnerability
CVE-2026-48710 is a vulnerability in Kludex Starlette that CISA added to its Known Exploited Vulnerabilities catalog on September 2, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 16, 2026.
CVE-2026-48710 is a vulnerability in Kludex Starlette that CISA added to its Known Exploited Vulnerabilities catalog on September 2, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 16, 2026.
- CVE ID
- CVE-2026-48710
- Vendor / project
- Kludex
- Product
- Starlette
- Added to KEV
- Due date
- Days to remediate
- 14
- Known ransomware use
- Unknown
- Weakness
- CWE-444
CISA description #
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.
Required action #
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.
Notes and references #
This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-48710
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