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Vulnerability Details :

CVE-2026-27700

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-25 Feb, 2026 | 15:01
Updated At-27 Feb, 2026 | 17:01
Rejected At-
Credits

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
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
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:25 Feb, 2026 | 16:23
Updated At:27 Feb, 2026 | 14:06

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Type: Secondary
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
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-290Primarysecurity-advisories@github.com
CWE-345Primarysecurity-advisories@github.com
CWE ID: CWE-290
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-345
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7security-advisories@github.com
N/A
https://github.com/honojs/hono/releases/tag/v4.12.2security-advisories@github.com
N/A
https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3security-advisories@github.com
N/A
Hyperlink: https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/honojs/hono/releases/tag/v4.12.2
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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