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

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之前版本存在信任管理问题漏洞，该漏洞源于信任管理问题，可能导致重复请求标头被截断至单一值，从而削弱或改变访问控制决策。

CVSS 4.8 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.25 affected
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I. Basic Information for CVE-2026-54289

Vulnerability Information
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Vulnerability Title
Hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest
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, 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 request headers such as X-Forwarded-For, Forwarded, and Via are silently truncated to a single value. Request middleware sees only the last value of a repeated header instead of the full chain. For applications that base access control on the X-Forwarded-For chain, this can weaken or alter that decision; for auditing, hop history is lost. This vulnerability is fixed in 4.12.25.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不可信的源
Source: CVE Program / CVE List V5
Vulnerability Title
honojs hono 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
honojs hono是honojs的Web服务器。 honojs hono 4.12.25之前版本存在信任管理问题漏洞，该漏洞源于信任管理问题，可能导致重复请求标头被截断至单一值，从而削弱或改变访问控制决策。
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-2026-54289

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III. Intelligence Information for CVE-2026-54289

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Vendor Advisories for CVE-2026-54289 (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-2026-54288 6.5 MEDIUM Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`
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

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-348

V. Comments for CVE-2026-54289

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