CVE-2026-59897 — MEDIUM (4.8)

Q: How severe is CVE-2026-59897?

CVE-2026-59897 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-59897?

Check the references section above for vendor advisories and patch information. Affected products include: Hono Hono.

Vulnerability Description

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 Score

4.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Hono	Hono	>= 4.3.3, < 4.12.27

Related Weaknesses (CWE)

CWE-348

References

FAQ

What is CVE-2026-59897?

CVE-2026-59897 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 becaus...

How severe is CVE-2026-59897?

CVE-2026-59897 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-59897?

Check the references section above for vendor advisories and patch information. Affected products include: Hono Hono.