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CVE-2026-25478— Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins

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，该漏洞源于正则表达式元字符未转义，可能导致恶意源意外匹配。

CVSS 7.4 · High EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-25478

Vulnerability Information
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Vulnerability Title
Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度许可的跨域白名单
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，该漏洞源于正则表达式元字符未转义，可能导致恶意源意外匹配。
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-2026-25478

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III. Intelligence Information for CVE-2026-25478

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Vendor Advisories for CVE-2026-25478 (1)

Other References for CVE-2026-25478 (1)

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

CVE-2026-25480 6.5 MEDIUM FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord
CVE-2026-25479 6.5 MEDIUM Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in co

IV. Related Vulnerabilities

Same product: litestar
Same vendor: litestar-org
Same weakness: CWE-942

V. Comments for CVE-2026-25478

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