CVE-2026-54288
Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`
Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, the Body Limit Middleware trusts the request's Content-Length header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared Content-Length, which need not match the actual payload. A client can declare a tiny Content-Length while sending a much larger body, slipping past the limit. This vulnerability is fixed in 4.12.25.
INFO
Published Date :
June 22, 2026, 5:18 p.m.
Last Modified :
June 22, 2026, 5:18 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-54288
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Hono to version 4.12.25 or later.
- Ensure Content-Length is validated against actual payload size.
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CVE-2026-54288 vulnerability anywhere in the article.