Description
Starlette is a lightweight ASGI framework/toolkit. Prior to 1.3.0, the HTTP request path is not validated before being used to reconstruct request.url. Because request.url is rebuilt by concatenating {scheme}://{host}{path} and re-parsing the result, a path that does not begin with / (for example @google.com) moves the authority boundary during re-parsing, so request.url.hostname and request.url.netloc become attacker-controlled. Code that reads request.url.hostname (rather than the Host header or scope) can therefore be misled into trusting an attacker-supplied host. This vulnerability is fixed in 1.3.0.
Published: 2026-06-22
Score: 3.7 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-jp82-jpqv-5vv3 Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname
History

Mon, 29 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1286
References
Metrics threat_severity

None

threat_severity

Low


Mon, 22 Jun 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Kludex
Kludex starlette
Vendors & Products Kludex
Kludex starlette

Mon, 22 Jun 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 22 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
Description Starlette is a lightweight ASGI framework/toolkit. Prior to 1.3.0, the HTTP request path is not validated before being used to reconstruct request.url. Because request.url is rebuilt by concatenating {scheme}://{host}{path} and re-parsing the result, a path that does not begin with / (for example @google.com) moves the authority boundary during re-parsing, so request.url.hostname and request.url.netloc become attacker-controlled. Code that reads request.url.hostname (rather than the Host header or scope) can therefore be misled into trusting an attacker-supplied host. This vulnerability is fixed in 1.3.0.
Title Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname
Weaknesses CWE-706
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}


Subscriptions

Kludex Starlette
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-22T17:26:58.637Z

Reserved: 2026-06-12T17:46:37.292Z

Link: CVE-2026-54282

cve-icon Vulnrichment

Updated: 2026-06-22T17:26:53.260Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Low

Publid Date: 2026-06-22T16:45:01Z

Links: CVE-2026-54282 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-29T14:30:18Z

Weaknesses