AWS
CVE-2026-27700
HIGH
GHSA-xh87-mx6m-69f3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 6 npm packages depend on hono (4 direct, 2 indirect)
Ecosystem-wide dependent count for version 4.12.0.
DescriptionGitHub Advisory
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.
AnalysisAI
Hono is a Web application framework that provides support for any JavaScript runtime. [CVSS 8.2 HIGH]
Technical ContextAI
Classified as CWE-290 (Authentication Bypass by Spoofing). Affects Hono. 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 mecha
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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Same weakness CWE-290 – Authentication Bypass by Spoofing
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External POC / Exploit Code
Leaving vuln.today