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TI-2026-22076 Aliases CVE-2026-27700GHSA-xh87-mx6m-69f3

Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo

Priority MEDIUM 41CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-290.

Summary

Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed. Version 4.12.2 patches the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00269 19th percentileScored 2026-11-07
Fix Fixed hono (honojs): 4.12.2hono (npm): 4.12.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
honojshono4.12.0 to before 4.12.24.12.2Patch availableCNA
—hono (npm)4.12.0 to before 4.12.24.12.2Patch availableGHSA-xh87-mx6m-69f3
  • hono Vendorhonojs Affected 4.12.0 to before 4.12.2 Fixed in 4.12.2 Patch available CNA
  • hono (npm) Vendor— Affected 4.12.0 to before 4.12.2 Fixed in 4.12.2 Patch available GHSA-xh87-mx6m-69f3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*4.12.0 to before 4.12.2Vulnerablehonojs
  • cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:* Versions 4.12.0 to before 4.12.2 Vulnerable ·honojs

Remediation

  • Fix · CNA hono (honojs) Fixed in 4.12.2
  • Fix · GHSA-xh87-mx6m-69f3 hono (npm) Fixed in 4.12.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27700
  2. 2026-10-03 Alias added: GHSA-xh87-mx6m-69f3

References

Patch 1

Advisory 2

Other 2

  • TI-2024-21741 Hono vulnerable to Restricted Directory Traversal in serveStatic with deno CVSS 3.1MEDIUM 5.3
  • TI-2024-32610 Hono vulnerable to bypass of CSRF Middleware by a request without Content-Type header. CVSS 3.1MEDIUM 5.9
  • TI-2024-29381 Hono CSRF middleware can be bypassed using crafted Content-Type header CVSS 3.1MEDIUM 5.0
  • TI-2026-23190 Hono: Arbitrary file access via serveStatic vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-18334 JWT algorithm confusion in Hono JWK Auth Middleware when JWK lacks "alg" (untrusted header.alg fallback) CVSS 3.1HIGH 8.2
  • TI-2026-18333 JWT Algorithm Confusion via Unsafe Default (HS256) in Hono JWT Middleware Allows Token Forgery and Auth Bypass CVSS 3.1HIGH 8.2
See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences