CVE-2026-59897
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4.8
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS probability
- 0.18%
- CWE
- CWE-348
- Published
- 2026-07-08
- Last modified
- 2026-07-09
Affected products
- honojs hono
Weakness type
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