CVE-2026-54287

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.

PUBLISHED Reserved 2026-06-12 | Published 2026-06-22 | Updated 2026-06-22 | Assigner GitHub_M

Problem types

CWE-116: Improper Encoding or Escaping of Output

Product status

References

github.com/...s/hono/security/advisories/GHSA-j6c9-x7qj-28xf

cve.org (CVE-2026-54287)

nvd.nist.gov (CVE-2026-54287)

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