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CVE-2026-59897

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

Published: Jul 8, 2026Updated: Jul 10, 2026 Sources: CVE List NVDCWE-348
4.8MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 92.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-348

Affected Products

hono
oss-projectaka hono js
honoLibrary
OSS Libraries / web-framework
honojs
oss-projectaka hono
honoLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available

References

https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd
github.com
https://github.com/honojs/hono/releases/tag/v4.12.27
github.com
https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc
github.com

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