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

Quick assessment

Affected
honojs hono
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

honojs hono是honojs的Web服务器。 honojs hono 4.12.25之前版本存在输入验证错误漏洞，该漏洞源于Body Limit Middleware信任请求的Content-Length标头判断主体是否在限制内，可能导致客户端声明很小的Content-Length同时发送更大的主体，绕过限制。

CVSS 6.5 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.25 affected
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I. Basic Information for CVE-2026-54288

Vulnerability Information
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Vulnerability Title
Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
honojs hono 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
honojs hono是honojs的Web服务器。 honojs hono 4.12.25之前版本存在输入验证错误漏洞，该漏洞源于Body Limit Middleware信任请求的Content-Length标头判断主体是否在限制内，可能导致客户端声明很小的Content-Length同时发送更大的主体，绕过限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono < 4.12.25 -

II. Public POCs for CVE-2026-54288

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III. Intelligence Information for CVE-2026-54288

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Vendor Advisories for CVE-2026-54288 (1)

Same Patch Batch · honojs · 2026-06-22 · 5 CVEs total

CVE-2026-54290 7.1 HIGH Hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the w
CVE-2026-54286 5.9 MEDIUM Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)
CVE-2026-54287 5.3 MEDIUM Hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping coo
CVE-2026-54289 4.8 MEDIUM Hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-345

V. Comments for CVE-2026-54288

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