CVE-2026-73565
Description
A flaw was found in @hono/node-server. An unauthenticated attacker can exploit this vulnerability by sending a WebSocket upgrade request with a missing or malformed Sec-WebSocket-Key header. This action causes the server to retain request data, leading to unbounded memory growth and eventually a Denial of Service (DoS), making the service unavailable.
Statement
The vulnerability in @hono/node-server is rated Moderate. An unauthenticated attacker can trigger a denial of service by sending malformed WebSocket upgrade requests, leading to unbounded memory growth.
Mitigation
To mitigate this issue, restrict network access to the affected Grafana instance to trusted clients only. This can be achieved by configuring firewall rules to limit incoming connections to the port Grafana listens on. If the service is reloaded or restarted, ensure firewall rules persist.
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 | 5.3 | N/A | 5.3 |
| 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 | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Understanding the Weakness (CWE)
Other,Confidentiality,Integrity
Technical Impact: Other; Read Application Data; Modify Application Data; DoS: Resource Consumption (Other)
It is possible to overflow the number of temporary files because directories typically have limits on the number of files allowed. This could create a denial of service problem.
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