uhop stream-json up to 3.6.x FlexAssembler resource consumption

Summaryinfo

A vulnerability classified as problematic was found in uhop stream-json up to 3.6.x. Affected by this issue is some unknown functionality of the component FlexAssembler. Executing a manipulation can lead to resource consumption. This vulnerability is tracked as CVE-2026-114129. The attack is restricted to local execution. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in uhop stream-json up to 3.6.x. It has been declared as problematic. This vulnerability affects an unknown function of the component FlexAssembler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. From 2.0.0 until 3.7.0, FlexAssembler compiles string and regular-expression path filters into matchers that join the full key stack on every container start. Because the key stack grows with unbounded object or array nesting, a document nested to depth D causes D joins whose cost grows with the current depth, resulting in quadratic CPU consumption on the single-threaded event loop. The join occurs before the rule match decision, so the attacker does not need to know the target schema. Consumers using only function filters or no rules are not affected. A crafted nested document can stall all concurrent work in a process that feeds it to an affected FlexAssembler. This issue is fixed in 3.7.0, which adds a default maximum depth.

The advisory is available at github.com. This vulnerability was named CVE-2026-114129 since 10/20/2026. The exploitation appears to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available.

Upgrading to version 3.7.0 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
• 3.6

Website

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

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