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CVE-2026-71429— stream-json: pick/ignore/filter/replace filters are O(depth²) on nested input — small crafted JSON blocks the event loop for seconds→minutes (DoS)

Quick assessment

Affected
uhop stream-json
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

stream-json 是一个用于处理 JSON 和 JSONC 的流式组件微型库，具有极低的内存占用。在 3.5.0 版本之前，位于 中的路径过滤器 、 、 和 在处理每个可检查 token 时，都会根据嵌套栈重新计算完整的路径字符串。由于栈的长度等于当前的嵌套深度，而每一层嵌套都会产生一个可检查 token，因此处理一个深度为 D 的文档的时间复杂度为 O(D²)，而不是 O(D)。该问题是由嵌套深度而非数据量触发的，包括文档中记录的 直到匹配为止的遍历路径。因此，一个将不受信任的 JSON 通过字符串或正则表

CVSS 6.2 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-71429

Vulnerability Information
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Vulnerability Title
stream-json: pick/ignore/filter/replace filters are O(depth²) on nested input — small crafted JSON blocks the event loop for seconds→minutes (DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
uhop stream-json < 3.5.0 -

II. Public POCs for CVE-2026-71429

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III. Intelligence Information for CVE-2026-71429

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Patches & Fixes for CVE-2026-71429 (1)

Vendor Advisories for CVE-2026-71429 (1)

IV. Related Vulnerabilities

Same vendor: uhop
Same weakness: CWE-407

V. Comments for CVE-2026-71429

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