CVE-2026-54288

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...

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

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...

CVE-2026-54288

The CVE-2026-54288 issue affects the Hono Web framework prior to version 4.12.25, where the Body Limit Middleware trusts the request Content-Length header. On AWS Lambda environments (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge), the body is fully buffered and the adapter builds the requ...

CVE-2026-54289 Hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda@Edge, CloudFront delivers a request header that appears more than once as several separate entries. The adapter writes each value with Headers.set instead of Headers.append, so...

CVE-2026-54289

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda@Edge, CloudFront delivers a request header that appears more than once as several separate entries. The adapter writes each value with Headers.set instead of Headers.append, so...

CVE-2026-54289

CVE-2026-54289 — Hono Lambda@Edge header handling : On AWS Lambda@Edge, prior to 4.12.25, CloudFront may deliver repeated headers as multiple entries. The Hono Lambda@Edge adapter uses Headers.set for each value, overwriting the previous one, so only the last value reaches the application. Header...

CVE-2026-54287

Summary: Hono’s AWS Lambda adapter, in the ALB single-header mode and VPC Lattice v2, concatenates multiple Set-Cookie headers into a single comma-separated value, causing cookie attributes that include commas (e.g., Expires) to be misparsed or dropped. Affected components: Hono web framework; AW...

CVE-2026-54287 Hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attribute...

Insufficient Verification of Data Authenticity

Overview hono is an Ultrafast web framework for the Edges Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity in the Body Limit Middleware. An attacker can cause the application to process payloads larger than the configured maximum by understating t...

GHSA-RV63-4MWF-QQC2 hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`

Summary 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...

hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`

Summary 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...

Improperly Implemented Security Check for Standard

Overview hono is an Ultrafast web framework for the Edges Affected versions of this package are vulnerable to Improperly Implemented Security Check for Standard in the Lambda@Edge adapter that truncates repeated request headers. An attacker can bypass access restrictions or affect auditing...

GHSA-WGPF-JWQJ-8H8P hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest

Summary On AWS Lambda@Edge, CloudFront delivers a request header that appears more than once as several separate entries. The adapter writes each value with Headers.set instead of Headers.append, so every value overwrites the previous one and only the last reaches the application. Repeated reques...

hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest

Summary On AWS Lambda@Edge, CloudFront delivers a request header that appears more than once as several separate entries. The adapter writes each value with Headers.set instead of Headers.append, so every value overwrites the previous one and only the last reaches the application. Repeated reques...

NPM: hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest

NPM: hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest vulnerability discovered by ? in WordPress Npm hono versions 4.12.25...

hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice

Summary On AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes for example Expires dates, clients cannot split the value back into individual cookies and...

Improper Encoding or Escaping of Output

Overview hono is an Ultrafast web framework for the Edges Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output in the AWS Lambda adapter's handling of multiple Set-Cookie headers. An attacker can cause clients to drop or misinterpret cookies by triggering...

GHSA-J6C9-X7QJ-28XF hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice

Summary On AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes for example Expires dates, clients cannot split the value back into individual cookies and...

NPM: hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice

NPM: hono: AWS Lambda adapter merges multiple Set-Cookie headers into one value, dropping cookies on ALB single-header and Lattice vulnerability discovered by ? in WordPress Npm hono versions 4.12.25...

PT-2026-49735

Name of the Vulnerable Software and Affected Versions Hono versions prior to 4.12.25 Description The Body Limit Middleware trusts the Content-Length header to determine if a request body is within the allowed limit. In environments such as AWS Lambda including API Gateway v1/v2, ALB, VPC Lattice,...