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CVE

CWE

Training

CVE-2026-25479

Published: Feb 9, 2026

Modified: Feb 10, 2026

PUBLISHED

CVSS v3.1

6.5

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.

Vendor	Product	Versions
litestar-org	litestar	affected `< 2.20.0`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

References

https://github.com/litestar-org/litestar/security/advisories/GHSA-93ph-p7v4-hwh4

x_refsource_CONFIRM

https://github.com/litestar-org/litestar/commit/06b36f481d1bfea6f19995cfb4f203aba45c4ace

x_refsource_MISC

https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0

x_refsource_MISC

https://github.com/litestar-org/litestar/releases/tag/v2.20.0

x_refsource_MISC

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