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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Hono组织开源的一系列超小型Web应用框架。 Hono 4.13.5之前版本存在输入验证错误漏洞，该漏洞源于查询助手将字面hash片段后的问号视为查询字符串开始，导致应用读取其他中间件未观察的参数，同时缓存中间件构建缓存键时移除片段，可能导致绕过过滤和审计、缓存投毒以及存储型跨站脚本攻击。

CVSS 5.9 · Medium EPSS 0.45% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.13.5 affected
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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
Vulnerability Title
Hono 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono组织开源的一系列超小型Web应用框架。 Hono 4.13.5之前版本存在输入验证错误漏洞，该漏洞源于查询助手将字面hash片段后的问号视为查询字符串开始，导致应用读取其他中间件未观察的参数，同时缓存中间件构建缓存键时移除片段，可能导致绕过过滤和审计、缓存投毒以及存储型跨站脚本攻击。
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
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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Patches & Fixes for CVE-2026-84363 (1)

Vendor Advisories for CVE-2026-84363 (1)

Vendor Pages for CVE-2026-84363 (1)

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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