CVE-2026-25479
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductLitestar
PublishedFeb 9, 2026
First seenFeb 9, 2026
Weakness typeCWE-185CWE-185
How to fix
Update
- litestar litestar2.20.0 or later
- litestar2.20.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| litestar litestar | v < 2.20.0 | 2.20.0 |
| litestarPyPI | 2.19.0 ≤ v < 2.20.0, v < 2.20.0 | 2.20.0 |
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