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.
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Affected Vendors & Products
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History
Tue, 10 Feb 2026 17:15:00 +0000
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ssvc
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Tue, 10 Feb 2026 16:30:00 +0000
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Litestar-org
Litestar-org litestar |
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| Vendors & Products |
Litestar-org
Litestar-org litestar |
Mon, 09 Feb 2026 19:30:00 +0000
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| 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 | |
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| Metrics |
cvssV3_1
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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
Updated: 2026-02-10T15:39:54.271Z
Status : Awaiting Analysis
Published: 2026-02-09T20:15:57.177
Modified: 2026-02-09T21:55:30.093
Link: CVE-2026-25479
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