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CVE-2026-59897

CVE-2026-59897 · Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substring comparison instead of an exact match, so middleware or application logic that depends on the complete X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation can receive incomplete data. This issue is fixed in version 4.12.27.

CVSS 4.8 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • hono

    Versions
    • >= 4.3.3, < 4.12.27: Affected

    No fix published

  • hono npm

    Affected ranges
    • SEMVER: ≥ 4.3.3, < 4.12.27

    Update to 4.12.27

Original sources

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