Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, in litestar.middleware.allowed_hosts, allowlist entries are compiled into regex patterns in a way that allows regex metacharacters to retain special meaning (e.g., . matches any character). This enables a bypass where an attacker supplies a host that matches the regex but is not the intended literal hostname. This vulnerability is fixed in 2.20.0.
History

Tue, 10 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 10 Feb 2026 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Litestar-org
Litestar-org litestar
Vendors & Products Litestar-org
Litestar-org litestar

Mon, 09 Feb 2026 19:30:00 +0000

Type Values Removed Values Added
Description Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, in litestar.middleware.allowed_hosts, allowlist entries are compiled into regex patterns in a way that allows regex metacharacters to retain special meaning (e.g., . matches any character). This enables a bypass where an attacker supplies a host that matches the regex but is not the intended literal hostname. This vulnerability is fixed in 2.20.0.
Title Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in configured host patterns
Weaknesses CWE-185
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-02-09T18:48:19.971Z

Updated: 2026-02-10T16:01:11.941Z

Reserved: 2026-02-02T16:31:35.821Z

Link: CVE-2026-25479

cve-icon Vulnrichment

Updated: 2026-02-10T15:39:54.271Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-09T20:15:57.177

Modified: 2026-02-09T21:55:30.093

Link: CVE-2026-25479

cve-icon Redhat

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