VulnerabilityDeferred

CVE-2026-54287

This vulnerability is fixed in 4.12.25.

MEDIUM 5.3EPSS 0.31%

Does this matter?

Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.31% probability · 24th percentile
CISA KEV: Not listed
Weakness: CWE-116
Source: security-advisories@github.com

References

https://github.com/honojs/hono/security/advisories/GHSA-j6c9-x7qj-28xf

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.