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CVE-2026-25479— Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in configured host patterns

Quick assessment

Affected
litestar-org litestar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Litestar是Litestar开源的一个强大、灵活但固执己见的 ASGI 框架。 Litestar 2.20.0之前版本存在安全漏洞，该漏洞源于允许列表条目编译方式不当，可能导致绕过主机名验证。

CVSS 6.5 · Medium EPSS 0.32% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-25479

Vulnerability Information
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Vulnerability Title
Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in configured host patterns
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
Source: CVE Program / CVE List V5
Vulnerability Title
Litestar 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Litestar是Litestar开源的一个强大、灵活但固执己见的 ASGI 框架。 Litestar 2.20.0之前版本存在安全漏洞，该漏洞源于允许列表条目编译方式不当，可能导致绕过主机名验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
litestar-org litestar < 2.20.0 -

II. Public POCs for CVE-2026-25479

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III. Intelligence Information for CVE-2026-25479

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Vendor Advisories for CVE-2026-25479 (1)

Other References for CVE-2026-25479 (1)

Same Patch Batch · litestar-org · 2026-02-09 · 3 CVEs total

CVE-2026-25478 7.4 HIGH Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allow
CVE-2026-25480 6.5 MEDIUM FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord

IV. Related Vulnerabilities

Same product: litestar
Same vendor: litestar-org
Same weakness: CWE-185

V. Comments for CVE-2026-25479

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