PT-2025-45759 · Npm · Hono

Published 2025-10-24 · Updated 2025-10-24

OSV

CVSS v3.1

4.2

Medium

Base vector

AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Summary

A flaw in the CORS middleware allowed request Vary headers to be reflected into the response, enabling attacker-controlled Vary values and potentially affecting cache behavior.

Details

The middleware previously copied the Vary header from the request when origin was not set to "*". Since Vary is a response header that should only be managed by the server, this could allow an attacker to influence caching behavior or cause inconsistent CORS handling.

Most environments will see impact only when shared caches or proxies rely on the Vary header. The practical effect varies by configuration.

Impact

May cause cache key pollution and inconsistent CORS enforcement in certain setups. No direct confidentiality, integrity, or availability impact in default configurations.

Resolution

Update to the latest patched release. The CORS middleware has been corrected to handle Vary exclusively as a response header.

Fix

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-444

Related Identifiers

GHSA-Q7JF-GF43-6X6P

Affected Products

Hono

References · 4

• https://osv.dev/vulnerability/GHSA-q7jf-gf43-6x6p · Vendor Advisory
• https://github.com/honojs/hono · Note
• https://github.com/honojs/hono/commit/d9b8b4b73b4f997994f2764013207365fe711282 · Note
• https://github.com/honojs/hono/security/advisories/GHSA-q7jf-gf43-6x6p · Note