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OpenAdvisories
Medium · 6.2 CVE-2026-104182 EUVD-2026-91056GHSA-hqr4-qq8f-hg3x

stream-json: JSONC parser and verifier re-scan the whole accumulated comment on every input chunk

Published Oct 1, 2026 · Updated Oct 5, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
uhop stream-json < 3.6.0 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling kubeflow-pipelines-frontend 2.18.0-r0 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm stream-json < 3.6.0 3.6.0 GHSA-hqr4-qq8f-hg3x

References