Insufficient verification of data authenticity in hono - CVE-2025-71381
Published: July 24, 2026
Vulnerability identifier: #VU139323
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-71381
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to influence caching behavior and cause inconsistent CORS handling.
The vulnerability exists due to improper handling of response headers in the CORS middleware when processing requests with attacker-controlled Vary headers. A remote attacker can send a specially crafted request to influence caching behavior and cause inconsistent CORS handling.
Impact is primarily observed in deployments that use shared caches or proxies relying on the Vary header.
Affected software
hono
How to mitigate CVE-2025-71381
Install security update from vendor's website.
hono - update to 4.10.3