CVE-2026-59897
Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication
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.
INFO
Published Date :
July 8, 2026, 5:17 p.m.
Last Modified :
July 10, 2026, 7:50 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Hono to version 4.12.27 or later.
- Verify header processing logic for completeness.
- Test rate limiting and audit logging functionality.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59897.
| URL | Resource |
|---|---|
| https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd | Patch |
| https://github.com/honojs/hono/releases/tag/v4.12.27 | Release Notes |
| https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59897 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59897
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59897 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59897 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 10, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:* versions from (including) 4.3.3 up to (excluding) 4.12.27 Added Reference Type GitHub, Inc.: https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd Types: Patch Added Reference Type GitHub, Inc.: https://github.com/honojs/hono/releases/tag/v4.12.27 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 09, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-59897', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-09T13:51:23.283182Z'} -
New CVE Received by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'honojs', 'product': 'hono', 'versions': [{'status': 'affected', 'version': '>= 4.3.3, < 4.12.27'}]}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Added CWE CWE-348 Added Reference https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd Added Reference https://github.com/honojs/hono/releases/tag/v4.12.27 Added Reference https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc