Is CVE-2026-54287 actively exploited?

No active exploitation of CVE-2026-54287 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54287 be exploited remotely?

Yes. CVE-2026-54287 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54287?

CVE-2026-54287 has a CVSS score of 5.3 (MEDIUM).

HOME VULNERABILITIESCVE-2026-54287

MEDIUM

CVE-2026-54287

CWE-116Published: June 22, 2026· Updated: Jun 22, 2026

5.3

CVSS v3.1

EPSS:0.19%probability of exploitation in 30 daysPercentile:8.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-54287 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.