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CVE-2026-84364— Hono: Unbounded dot-notation nesting in `parseBody()` can cause memory exhaustion

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之前版本存在资源管理错误漏洞，该漏洞源于parseBody()展开点分隔表单字段名时未限制嵌套深度或中间对象数量，可能导致未经身份验证的攻击者发送并发请求耗尽JavaScript堆，终止服务进程，导致服务不可用。

CVSS 5.3 · Medium EPSS 0.53% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.13.5 affected
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I. Basic Information for CVE-2026-84364

Vulnerability Information
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Vulnerability Title
Hono: Unbounded dot-notation nesting in `parseBody()` can cause memory exhaustion
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, when parseBody() expands dot-separated form field names into nested objects with dot-notation parsing enabled, it does not limit the nesting depth or the total number of intermediate objects created. Empty segments are preserved, so one deeply dotted field name can encode one nesting level per byte, while a large number of shallowly dotted fields can create the same amplification across a request. A request body within a normal size limit can therefore allocate an object graph far larger than the request after the body has already been accepted. An unauthenticated attacker who can reach an affected endpoint can send concurrent requests that exhaust the JavaScript heap, terminate the server process, and leave the service unavailable until restart. Dot-notation parsing is not enabled by default, and applications using the default behavior 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:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于parseBody()展开点分隔表单字段名时未限制嵌套深度或中间对象数量，可能导致未经身份验证的攻击者发送并发请求耗尽JavaScript堆，终止服务进程，导致服务不可用。
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-2026-84364

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III. Intelligence Information for CVE-2026-84364

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Patches & Fixes for CVE-2026-84364 (1)

Vendor Advisories for CVE-2026-84364 (1)

Vendor Pages for CVE-2026-84364 (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-2026-84363 5.9 MEDIUM Hono: Query parser reads parameters after the URL fragment, causing cache-key and proxy in

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-400

V. Comments for CVE-2026-84364

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