honojs node-server up to 1.19.17/2.0.0/2.1.5 WHATWG URL Parser access control

Summaryinfo

A vulnerability classified as problematic was found in honojs node-server up to 1.19.17/2.0.0/2.1.5. This affects an unknown part of the component WHATWG URL Parser. The manipulation results in access control. This vulnerability was named CVE-2026-126210. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in honojs node-server up to 1.19.17/2.0.0/2.1.5. Affected is an unknown function of the component WHATWG URL Parser. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality. CVE summarizes:

@hono/node-server allows running the Hono application on Node.js. Prior to 1.19.18 and from 2.0.0 until 2.1.6, the server passes a raw request-target containing a backslash in its path to the WHATWG URL parser, which treats the backslash as a path separator and resolves dot segments. A reverse proxy, load balancer, or web application firewall that preserves the backslash and applies path-based rules to the original request can therefore permit a request that the application normalizes to a blocked route. This lets an unauthenticated client reach route content that the upstream component was intended to deny, while Hono application access controls are unaffected because they operate on the normalized path. This issue is fixed in versions 1.19.18 and 2.1.6.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-126210 since 11/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 1.19.18 or 2.1.6 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• honojs

Name

• node-server

Version

• 1.19.0
• 1.19.1
• 1.19.2
• 1.19.3
• 1.19.4
• 1.19.5
• 1.19.6
• 1.19.7
• 1.19.8
• 1.19.9
• 1.19.10
• 1.19.11
• 1.19.12
• 1.19.13
• 1.19.14
• 1.19.15
• 1.19.16
• 1.19.17
• 2.0
• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5

Website

• Product: https://github.com/honojs/node-server/

CPE 2.3info

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