SB2026072198 - Path traversal in Hono

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Main Vulnerability Database SB2026072198

SB2026072198 - Path traversal in Hono

Published: July 21, 2026

Security Bulletin ID SB2026072198
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Path traversal (CVE-ID: CVE-2026-54286)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to on Windows hosts, an encoded backslash (%5C) in the request path decodes to , which the Windows path resolver treats as a separator. serve-static then resolves a single URL segment such as adminsecret.txt into a nested file under the root and serves it. A remote attacker can send a specially crafted HTTP request and read static files meant to be protected behind prefix-mounted middleware.


Remediation

Install update from vendor's website.

References