User Impersonation Affecting hono package, versions >=4.12.0 <4.12.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-HONO-15353409
- published26 Feb 2026
- disclosed25 Feb 2026
- creditEdamAme-x
Introduced: 25 Feb 2026
NewCVE-2026-27700 (opens in a new tab)How to fix?
Upgrade hono to version 4.12.2 or higher.
Overview
hono is an Ultrafast web framework for the Edges
Affected versions of this package are vulnerable to User Impersonation via the getConnInfo function in the adapter/aws-lambda/conninfo.ts file. An attacker can gain unauthorized access to resources protected by IP-based access controls by supplying a crafted X-Forwarded-For header.
Note:
This is only exploitable if the deployment uses the AWS Lambda adapter behind an Application Load Balancer (ALB) and relies on getConnInfo() for IP-based authorization decisions.