CVE-2026-54288 — Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
honojs / hono	affected < 4.12.25

CWE

CWE-345

References

https://github.com/honojs/hono/security/advisories/GHSA-rv63-4mwf-qqc2

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.