honojs Hono up to 4.13.4 Dot-notation Parsing parseBody resource consumption

Summaryinfo

A vulnerability was found in honojs Hono up to 4.13.4. It has been declared as problematic. Affected by this vulnerability is the function parseBody of the component Dot-notation Parsing. The manipulation results in resource consumption. This vulnerability is cataloged as CVE-2026-84364. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in honojs Hono up to 4.13.4. It has been classified as problematic. Affected is the function parseBody of the component Dot-notation Parsing. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-84364 since 09/01/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 4.13.5 eliminates this vulnerability.

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Productinfo

Vendor

• honojs

Name

• Hono

Version

• 4.13.0
• 4.13.1
• 4.13.2
• 4.13.3
• 4.13.4

Website

• Product: https://github.com/honojs/hono/

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