CVE-2026-54287
Medium
Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes (for example Expires dates), clients cannot split the value back into individual cookies and silently drop or misparse them. This vulnerability is fixed in 4.12.25.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Hono
PublishedJun 22, 2026
First seenJun 22, 2026
Weakness typeCWE-116CWE-116
How to fix
Update
- hono4.12.25 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hononpm | v < 4.12.25 | 4.12.25 |
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