Web Application Framework Vulnerability in Hono Affecting AWS Lambda
CVE-2026-54287

5.3MEDIUM

Key Information:

Vendor

Honojs

Status
Hono
Vendor
CVE Published:
22 June 2026

What is CVE-2026-54287?

Hono, a versatile web application framework that supports various JavaScript runtimes, has a vulnerability affecting its deployment on AWS Lambda. Prior to version 4.12.25, Hono incorrectly joined multiple Set-Cookie headers into a single comma-separated value within its responses for both the ALB single-header and VPC Lattice v2. This misconfiguration prevents clients from accurately parsing individual cookie values, leading to potential data loss or misinterpretation of cookie attributes such as expiration dates. Users are advised to upgrade to version 4.12.25 to mitigate this issue and ensure proper cookie management.

Affected Version(s)

hono < 4.12.25

References

https://github.com/honojs/hono/security/advisories/GHSA-j...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.