uhop stream-json up to 3.5.x JSONC parser parser.js resource consumption

Summaryinfo

A vulnerability was found in uhop stream-json up to 3.5.x. It has been rated as problematic. This vulnerability affects unknown code of the file stream-json/jsonc/parser.js of the component JSONC parser. The manipulation leads to resource consumption. This vulnerability is documented as CVE-2026-104182. The attack needs to be performed locally. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in uhop stream-json up to 3.5.x. It has been rated as problematic. This issue affects an unknown function of the file stream-json/jsonc/parser.js of the component JSONC parser. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. Prior to 3.6.0, the JSONC parser at stream-json/jsonc/parser.js and verifier at stream-json/jsonc/verifier.js restart comment-terminator scanning from the opening slash whenever a block or line comment spans an input chunk, while retaining the accumulated comment buffer. Delivering a large valid comment across many small chunks therefore causes quadratic CPU work and can stall the Node.js event loop. The maintainer characterizes the attack vector as local because the documented JSONC input is locally owned or user-controlled configuration, rather than input intended for the open internet. This JSONC-only scope does not include the plain JSON parser, which advances through and discards consumed string and number data. This issue is fixed in version 3.6.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-104182 since 10/01/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.6.0 eliminates this vulnerability.

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Productinfo

Vendor

• uhop

Name

• stream-json

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5

Website

• Product: https://github.com/uhop/stream-json/

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