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CVE-2026-54282— Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname

Quick assessment

Affected
Kludex starlette
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kludex starlette是Kludex的Web框架。 Kludex Starlette 1.3.0之前版本存在输入验证错误漏洞，该漏洞源于HTTP请求路径未验证，可能导致攻击者控制request.url.hostname和request.url.netloc，从而误导信任攻击者提供的主机。

CVSS 3.7 · Low EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Kludex starlette < 1.3.0 affected
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I. Basic Information for CVE-2026-54282

Vulnerability Information
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Vulnerability Title
Starlette: Unvalidated request path concatenated into authority poisons request.url.hostname
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
Source: CVE Program / CVE List V5
Vulnerability Title
Kludex Starlette 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kludex starlette是Kludex的Web框架。 Kludex Starlette 1.3.0之前版本存在输入验证错误漏洞，该漏洞源于HTTP请求路径未验证，可能导致攻击者控制request.url.hostname和request.url.netloc，从而误导信任攻击者提供的主机。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kludex starlette < 1.3.0 -

II. Public POCs for CVE-2026-54282

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III. Intelligence Information for CVE-2026-54282

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Vendor Advisories for CVE-2026-54282 (1)

Same Patch Batch · Kludex · 2026-06-22 · 6 CVEs total

CVE-2026-53539 7.5 HIGH Python-Multipart: Quadratic-time querystring parsing with semicolon separators causes CPU
CVE-2026-54283 7.5 HIGH Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded en
CVE-2026-53537 3.7 LOW Python-Multipart: Content-Disposition parameter smuggling via RFC 2231/5987 extended param
CVE-2026-53540 3.7 LOW Python-Multipart: Negative Content-Length in parse_form buffers the entire body in memory
CVE-2026-53538 3.7 LOW Python-Multipart: Semicolon treated as querystring field separator enables parameter smugg

IV. Related Vulnerabilities

Same product: starlette
Same vendor: Kludex
Same weakness: CWE-706

V. Comments for CVE-2026-54282

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