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CVE Vulnerability Details :
CVE-2026-27700
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-25 Feb, 2026 | 15:01
Updated At-27 Feb, 2026 | 17:01
Rejected At-
▼CVE Numbering Authority (CNA)
Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo

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.

Affected Products
Vendor
honojs
Product
hono
Versions
Affected
  • >= 4.12.0, < 4.12.2
Problem Types
TypeCWE IDDescription
CWECWE-345CWE-345: Insufficient Verification of Data Authenticity
CWECWE-290CWE-290: Authentication Bypass by Spoofing
Type: CWE
CWE ID: CWE-345
Description: CWE-345: Insufficient Verification of Data Authenticity
Type: CWE
CWE ID: CWE-290
Description: CWE-290: Authentication Bypass by Spoofing
Metrics
VersionBase scoreBase severityVector
3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3
x_refsource_CONFIRM
https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7
x_refsource_MISC
https://github.com/honojs/hono/releases/tag/v4.12.2
x_refsource_MISC
Hyperlink: https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7
Resource:
x_refsource_MISC
Hyperlink: https://github.com/honojs/hono/releases/tag/v4.12.2
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Details not found