Vulnerability in Encode Starlette
CVE-2026-48710
Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `re…
Vulnerability class: HTTP Request Smuggling
EPSS: 0.004 (57.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Encode Starlette
- Kludex Starlette — versions < 1.0.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Mitigation)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Mitigation)
- security-advisories@github.com (Exploit, Third Party Advisory, x_refsource_MISC, Mitigation)
- security-advisories@github.com (Exploit, Third Party Advisory, x_refsource_MISC, Mitigation)
Frequently asked questions
- What is CVE-2026-48710?
- CVE-2026-48710 is a medium-severity vulnerability in Encode Starlette, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 6.5/10. Published 2026-05-26.
- How severe is CVE-2026-48710?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2026-48710 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.