CVE-2025-71381
Description
A flaw was found in Hono's Cross-Origin Resource Sharing (CORS) middleware. When the origin is not set to a wildcard, the middleware improperly copies the Vary header from incoming requests into the response. This allows an attacker to inject arbitrary Vary values, potentially leading to cache key pollution and inconsistent CORS enforcement. Such an issue can affect environments that rely on shared caches or proxies, potentially enabling a bypass of CORS policies.
Statement
Red Hat products that include the Hono npm package already ship version 4.11.4 or later, which contains the fix for this vulnerability. No Red Hat products are affected.
Mitigation
No mitigation is needed. All Red Hat products shipping the Hono npm package already include a version that contains the fix for this issue.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
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