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CVE-2025-71381— Hono - Vary Header Injection in CORS Middleware

Quick assessment

Affected
Hono Hono
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.

Hono是Hono团队开源的一个用 TypeScript 编写的 Web 框架。 Hono 4.10.2之前版本存在输入验证错误漏洞，该漏洞源于其CORS中间件存在一个缺陷，可能导致攻击者提供任意的Vary值并反射到响应中，从而在依赖共享缓存或代理的环境中可能引起缓存键污染和CORS策略执行不一致。

CVSS 6.5 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 2

VendorProduct Version RangeStatus
Hono Hono < 4.10.2 affected
4.10.2 unaffected
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I. Basic Information for CVE-2025-71381

Vulnerability Information
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Vulnerability Title
Hono - Vary Header Injection in CORS Middleware
Source: CVE Program / CVE List V5
Vulnerability Description
Hono before 4.10.2 (fixed in 4.10.3) contains a flaw in its CORS middleware: when the origin is not set to "*", the middleware copies the Vary header from the incoming request into the response. Because Vary is a response header that should be managed by the server, an attacker can supply arbitrary Vary values that are reflected into the response, potentially causing cache key pollution and inconsistent CORS enforcement in environments that rely on shared caches or proxies.
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
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono团队开源的一个用 TypeScript 编写的 Web 框架。 Hono 4.10.2之前版本存在输入验证错误漏洞，该漏洞源于其CORS中间件存在一个缺陷，可能导致攻击者提供任意的Vary值并反射到响应中，从而在依赖共享缓存或代理的环境中可能引起缓存键污染和CORS策略执行不一致。
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
Hono Hono 0 ~ 4.10.2 -

II. Public POCs for CVE-2025-71381

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III. Intelligence Information for CVE-2025-71381

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Vendor Advisories for CVE-2025-71381 (1)

News Coverage for CVE-2025-71381 (1)

IV. Related Vulnerabilities

Same product: Hono
Same vendor: Hono
Same weakness: CWE-113

V. Comments for CVE-2025-71381

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