High severityNVD Advisory· Published Feb 25, 2026· Updated Feb 27, 2026
Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo
CVE-2026-27700
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
hononpm | >= 4.12.0, < 4.12.2 | 4.12.2 |
Affected products
4- osv-coords3 versions
< 9.1.10-r6+ 2 more
- (no CPE)range: < 9.1.10-r6
- (no CPE)range: < 9.1.10-r6
- (no CPE)range: >= 4.12.0, < 4.12.2
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-xh87-mx6m-69f3ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-27700ghsaADVISORY
- github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7ghsax_refsource_MISCWEB
- github.com/honojs/hono/releases/tag/v4.12.2ghsax_refsource_MISCWEB
- github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3ghsax_refsource_CONFIRMWEB
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