What’s Vulnerable › Vulnerabilities

CVE-2026-54289: Hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-22 · updated 2026-10-25
• Weakness: CWE-348

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda@Edge, CloudFront delivers a request header that appears more than once as several separate entries. The adapter writes each value with Headers.set instead of Headers.append, so every value overwrites the previous one and only the last reaches the application. Repeated request headers such as X-Forwarded-For, Forwarded, and Via are silently truncated to a single value. Request middleware sees only the last value of a repeated header instead of the full chain. For applications that base access control on the X-Forwarded-For chain, this can weaken or alter that decision; for auditing, hop history is lost. This vulnerability is fixed in 4.12.25.

Affected products

• honojs hono: before 4.12.25

References

• https://github.com/honojs/hono/security/advisories/GHSA-wgpf-jwqj-8h8p
• https://github.com/honojs/hono/security/advisories/GHSA-wgpf-jwqj-8h8p

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