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CVE-2026-84363— Hono: Query parser reads parameters after the URL fragment, causing cache-key and proxy interpretation differentials

Quick assessment

Affected
honojs 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 是一个为任意 JavaScript 运行时提供支持的 Web 应用框架。在 4.13.5 版本之前，Hono 的查询参数辅助函数会将字面量哈希片段（#）后面的问号（?）视为查询字符串的开始。这导致应用程序可以读取到浏览器、 构造器、反向代理、过滤规则、参数允许/拒绝列表、访问日志、请求校验以及其他中间件均未观察到的请求参数。 Cache 中间件在构建缓存键时会移除片段（fragment），这使得由片段内参数所影响的响应可能被存储在一个未包含这些参数的键下，并随后被提供给其他用户。这种情况可以绕过过滤和审计

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-84363

Vulnerability Information
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Vulnerability Title
Hono: Query parser reads parameters after the URL fragment, causing cache-key and proxy interpretation differentials
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.13.5, Hono's query helpers treat a question mark after a literal hash fragment as the start of a query string, so the application can read request parameters that browsers, new URL(), reverse proxies, filtering rules, parameter allow and deny lists, access logging, request validation, and other middleware do not observe. The Cache Middleware removes the fragment when building its cache key, allowing a response influenced by parameters inside the fragment to be stored under a key that omits those parameters and later served to other users. This can bypass filtering and auditing, poison cached responses, and enable stored cross-site scripting when an affected parameter is reflected into cached HTML without escaping. Exploitation requires a runtime and intermediary path that passes a literal hash character through to the request URL; Cloudflare Workers and intermediaries that strip fragments are not affected. This issue is fixed in version 4.13.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono < 4.13.5 -

II. Public POCs for CVE-2026-84363

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III. Intelligence Information for CVE-2026-84363

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Other References for CVE-2026-84363 (3)

Same Patch Batch · honojs · 2026-09-01 · 3 CVEs total

CVE-2026-84365 6.5 MEDIUM Hono: Incomplete fix for CVE-2026-39408: `toSSG()` still writes files outside the output d
CVE-2026-84364 5.3 MEDIUM Hono: Unbounded dot-notation nesting in `parseBody()` can cause memory exhaustion

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-444

V. Comments for CVE-2026-84363

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