litestar-org Litestar up to 2.21.x AllowedHostsMiddleware server-side request forgery

Summaryinfo

A vulnerability labeled as critical has been found in litestar-org Litestar up to 2.21.x. Affected by this vulnerability is an unknown functionality of the component AllowedHostsMiddleware. Such manipulation leads to server-side request forgery. This vulnerability is uniquely identified as CVE-2026-48061. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in litestar-org Litestar up to 2.21.x and classified as critical. Affected by this issue is an unknown part of the component AllowedHostsMiddleware. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. In versions prior to 2.22.0, an attacker can bypass the allowed hosts validation by omitting the Host header and supplying an X-Forwarded-Host header set to a whitelisted domain. The AllowedHostsMiddleware trusts the X-Forwarded-Host header as a fallback when the Host header is absent. Since X-Forwarded-Host is a client-controllable header, this enables host header injection attacks such as password reset poisoning, cache poisoning, and server-side request routing manipulation. Any application using AllowedHostsConfig is affected when deployed without a reverse proxy that strips X-Forwarded-Host, or when accepting HTTP/1.0 connections. This issue has been fixed in version 2.22.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-48061 since 05/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 2.22.0 eliminates this vulnerability.

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Productinfo

Vendor

• litestar-org

Name

• Litestar

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21

Website

• Product: https://github.com/litestar-org/litestar/

CPE 2.3info

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CPE 2.2info

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