EUVD-2026-70733
GHSA-528h-pc64-c93x
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N reflects primary use in network-facing Node.js services receiving untrusted JSON; PR:N because no authentication is required to submit a crafted payload; A:H because the event-loop block affects all concurrent requests.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3Blast Radius
ecosystem impact- 3 npm packages depend on stream-json (3 direct, 0 indirect)
Ecosystem-wide dependent count for version 3.5.0.
DescriptionCVE.org
stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. Prior to 3.5.0, the path filters pick, ignore, filter, and replace in src/core/filters/filter-base.js recompute the full path string from the nesting stack for every checkable token. Because the stack length equals the current nesting depth and a checkable token is emitted at every level, a depth D document costs O(D²) rather than O(D) to process. The issue is triggered by nesting depth rather than byte volume, including the documented pick({filter: 'data'}) traversal-until-match path, so an application that sends untrusted JSON through a string or RegExp filter can block the Node.js event loop and cause denial of service with a small deeply nested document. The streamArray, streamObject, and streamValues streamers are not affected because they use the constant-time asm.depth getter. This issue is fixed in version 3.5.0.
AnalysisAI
Quadratic algorithmic complexity (O(D²)) in stream-json's pick, ignore, filter, and replace path filters allows an attacker supplying a small, deeply-nested JSON document to block the Node.js event loop for seconds to minutes, effectively causing denial of service. The root cause is that filter-base.js recomputes the full dot-separated path string by rejoining the entire nesting stack on every checkable token - so a document of depth D incurs O(D²) CPU work regardless of byte size. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application uses stream-json's pick, ignore, filter, or replace path filters (from filter-base.js) - specifically not the streamArray, streamObject, or streamValues APIs - and that the application passes attacker-controlled JSON input to those filters without a prior depth check. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-provided CVSS vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H scores 6.2 (Medium), but the AV:L attribution is inconsistent with the primary documented threat model: an application receiving untrusted JSON over a network and passing it to a stream-json filter. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade stream-json to version 3.5.0 or later, which introduces a maxDepth option (default: 1024) that throws a RangeError when input nesting exceeds the limit, bounding worst-case complexity. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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