Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Litestar | Litestar | < 2.20.0 |
Related Weaknesses (CWE)
References
- https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0Release Notes
- https://github.com/litestar-org/litestar/commit/06b36f481d1bfea6f19995cfb4f203abPatch
- https://github.com/litestar-org/litestar/releases/tag/v2.20.0Release Notes
- https://github.com/litestar-org/litestar/security/advisories/GHSA-93ph-p7v4-hwh4ExploitVendor Advisory
FAQ
What is CVE-2026-25479?
CVE-2026-25479 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 re...
How severe is CVE-2026-25479?
CVE-2026-25479 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25479?
Check the references section above for vendor advisories and patch information. Affected products include: Litestar Litestar.