CVE-2026-106071
Description
A flaw was found in the Node.js Permission Model. Wildcard --allow-fs-read or --allow-fs-write rules can grant access to paths that do not match the intended wildcard when the requested path is shorter than the wildcard prefix and the radix-tree lookup stops comparing early. For example, --allow-fs-read=/etc/passwd.* may also allow 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 and affects the Node.js 26.x line.
Statement
This is a Low severity flaw. Red Hat rates it Low because the Permission Model is an opt-in experimental hardening feature (--permission), exploitation needs a specific wildcard grant layout (high attack complexity), and impact is limited to additional filesystem read/write within that model (Low/Low). Deployments that do not enable --permission are not exposed. The issue is confined to Node.js 26.x.
Mitigation
If the Permission Model is unused, do not enable --permission.
When using --allow-fs-read/--allow-fs-write, avoid wildcard grants placed as the sole root-level rule; prefer explicit directory prefixes without ambiguous wildcards.
Combine application allowlists with OS confinement such as SELinux or container filesystem restrictions .
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.6 | N/A | 3.6 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | High |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
cve.org: 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
Red Hat CVSS v3 Score Explanation
Base metrics only (CNA also listed environmental CR/IR/AR). AC:H — requires --permission plus a wildcard grant that triggers radix early-match. Opt-in experimental Permission Model. Node.js 26.x only.
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context; Gain Privileges or Assume Identity
When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc.
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