CVE-2026-27700 affects Hono versions 4.12.0 and 4.12.1 when using the AWS Lambda adapter behind an Application Load Balancer. The vulnerability allows IP-based access control bypass due to incorrect parsing of the X-Forwarded-For header, where an attacker could spoof their IP address. This is a high-severity vulnerability with a CVSS score of 7.5, indicating a network-based attack with low complexity and high impact on confidentiality. There is no evidence of active exploitation, public exploit code, or KEV listing, but it has garnered some community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 4.12.0, < 4.12.2CPE matchmatch criteria | cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.