CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NCVE-2026-25479
Medium (6.5) in litestar litestar. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in litestar 2.20.0.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
- CWE
- CWE-185
- Published
- Modified
- Record from
- the NVD, synced
Affected
- litestar:litestar
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-93ph-p7v4-hwh4 | PyPI | litestar | >=2.19.0 <2.20.0 | 2.20.0 |
| PYSEC-2026-2196 | PyPI | litestar | <2.20.0 | 2.20.0 |