SB2026072197 - Improper Encoding or Escaping of Output in Hono

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Main Vulnerability Database SB2026072197

SB2026072197 - Improper Encoding or Escaping of Output in Hono

Published: July 21, 2026

Security Bulletin ID SB2026072197
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Encoding or Escaping of Output (CVE-ID: CVE-2026-54287)

CWE-ID: CWE-116 - Improper Encoding or Escaping of Output

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to modify data on the system.

The vulnerability exists due to 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. A remote attacker can trigger improper encoding or escaping of output to modify data on the system.


Remediation

Install update from vendor's website.

References