CVE-2026-54288: Honojs Hono

Medium severity, CVSS 6.5. EPSS: 0.1% chance of exploitation in the next 30 days.

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 products

• Honojs Hono: before 4.12.25 (fixed in 4.12.25)

Published 2026-06-22. Last modified 2026-06-23.