PT-2026-49734 · Npm · Hono
Published
2026-06-16
·
Updated
2026-06-16
·
CVE-2026-54287
CVSS v3.1
5.3
Medium
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Summary
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.Details
Per RFC 6265, each cookie must be its own
Set-Cookie header line, and commas may appear inside attribute values. Joining cookies with ", " collides with those commas, producing a value that clients cannot reliably split. Only ALB single-header mode and VPC Lattice v2 are affected; API Gateway v1/v2 and ALB with multi-value headers enabled already use an array and are unaffected.Impact
A client may receive only one of the cookies, a malformed cookie, or none. Session, CSRF, or preference cookies can silently fail to apply, breaking sessions or forcing re-authentication. This affects applications that set multiple cookies per response and run on AWS Lambda behind an ALB in single-header mode (the default) or VPC Lattice v2.
Fix
Improper Encoding or Escaping of Output
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Weakness Enumeration
Related Identifiers
Affected Products
Hono