Bug 2558418 (CVE-2026-114129)

Summary: CVE-2026-114129 stream-json: stream-json: Denial of Service via deeply nested JSON documents
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: cdrage, rushinde
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in stream-json. The FlexAssembler component does not enforce a limit on nesting depth when processing JSON documents configured with path filters. By submitting a crafted document with deeply nested objects or arrays, an attacker can trigger excessive key operations that consume disproportionate CPU resources. This can result in a Denial of Service (DoS) by stalling concurrent tasks in the application process.
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Description OSIDB Bzimport 2026-10-21 17:52:33 UTC 
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.