CVE-2026-25478
High
Description
Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, CORSConfig.allowed_origins_regex is constructed using a regex built from configured allowlist values and used with fullmatch() for validation. Because metacharacters are not escaped, a malicious origin can match unexpectedly. The check relies on allowed_origins_regex.fullmatch(origin). This vulnerability is fixed in 2.20.0.
SeverityHigh
CVSS7.4
Exploit probability—
ProductLitestar
PublishedFeb 9, 2026
First seenFeb 9, 2026
Weakness typeCWE-942CWE-942
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 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.