Vulnerability in Uhop Stream-Json
CVE-2026-104182
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.
Published .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Uhop Stream-Json — versions < 3.6.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-104182?
- CVE-2026-104182 is a medium-severity vulnerability in Uhop Stream-Json, classified under Inefficient Algorithmic Complexity. CVSS score: 6.2/10. Published 2026-10-01.
- How severe is CVE-2026-104182?
- Medium severity. CVSS v3 base score is 6.2 out of 10.