CVE-2026-25724: @anthropic ai/claude code Claude Code Has Permission Deny Vulnerability

LOW
Advisory Identifier: GHSA-4q92-rfm6-2cqx
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CWE-285 CWE-61
Published
Advisory Summary

CVE-2026-25724 is a LOW claude code has permission deny vulnerability (CWE-285: Improper Authorization) affecting @anthropic ai/claude code libraries in the npm ecosystem. The issue involves claude code has permission deny bypass through symbolic links. Remediation is available by upgrading affected packages to version 2.1.7.

CVE-2026-25724 at a Glance

CVE Identifier CVE-2026-25724
GHSA Identifier GHSA-4q92-rfm6-2cqx
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-285: Improper Authorization
Affected Product @anthropic ai/claude code
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-25724

To remediate this vulnerability, upgrade all affected @anthropic ai/claude code dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@anthropic-ai/claude-code fixed: 2.1.7 
npm install @anthropic-ai/claude-code@2.1.7
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @anthropic-ai/claude-code

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-25724, inspect your project dependencies using npm:

npm ls @anthropic-ai/claude-code

Analyze the terminal output to locate any version of @anthropic ai/claude code in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.1.7), your application is affected.

Note: The npm ls @anthropic-ai/claude-code command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-285: Improper Authorization, where the product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. In @anthropic ai/claude code, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Claude Code failed to strictly enforce deny rules configured in settings.json when accessing files through symbolic links. If a user explicitly denied Claude Code access to a file (such as /etc/passwd) and Claude Code had access to a symbolic link pointing to that file, it was possible for Claude Code to read the restricted file through the symlink without triggering deny rule enforcement. Users on standard Claude Code auto-update received this fix automatically. Users performing manual updates are advised to update to the latest version. Claude Code thanks https://hackerone.com/ofirh for reporting this issue.

CVE-2026-25724 Affected @anthropic ai/claude code Versions

1 component(s)
Fixed Versions:
2.1.7
Product / Package Ecosystem Affected Versions Fixed Version
@anthropic-ai/claude-code
npm/@anthropic-ai/claude-code
npm
< 2.1.7
2.1.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/anthropics/claude-code/security/advisories/GHSA-4q92-rfm6-2cqx
NVD — CVE-2026-25724 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25724
@anthropic ai/claude code Source Repository REPOSITORY
https://github.com/anthropics/claude-code
@anthropic ai/claude code Security Information SECURITY
https://www.terra.security/blog/when-ai-becomes-the-attack-surface-lessons-from-discovering-cve-2026-25724

Frequently Asked Questions

What is CVE-2026-25724?
CVE-2026-25724 is a security vulnerability in @anthropic ai/claude code involving Claude Code has Permission Deny Bypass Through Symbolic Links under CWE-285: Improper Authorization.
Which @anthropic ai/claude code versions are affected?
Affected versions include releases prior to 2.1.7 across affected packages: @anthropic-ai/claude-code.
What version fixes CVE-2026-25724?
Upgrading to 2.1.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @anthropic-ai/claude-code affected?
Yes, @anthropic-ai/claude-code is affected in releases prior to 2.1.7. Upgrade your dependency to 2.1.7 or later.
What CWE is associated with CVE-2026-25724?
CVE-2026-25724 is classified under CWE-285: Improper Authorization (The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.).
How can I check npm dependencies for CVE-2026-25724?
Run the dependency tree command: 'npm ls @anthropic-ai/claude-code'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4q92-rfm6-2cqx",
  "modified" : "2026-03-30T19:59:02Z",
  "published" : "2026-02-06T19:08:04Z",
  "aliases" : [ "CVE-2026-25724" ],
  "summary" : "Claude Code has Permission Deny Bypass Through Symbolic Links",
  "details" : "Claude Code failed to strictly enforce deny rules configured in settings.json when accessing files through symbolic links. If a user explicitly denied Claude Code access to a file (such as /etc/passwd) and Claude Code had access to a symbolic link pointing to that file, it was possible for Claude Code to read the restricted file through the symlink without triggering deny rule enforcement. \n\nUsers on standard Claude Code auto-update received this fix automatically. Users performing manual updates are advised to update to the latest version.\n\nClaude Code thanks https://hackerone.com/ofirh for reporting this issue.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@anthropic-ai/claude-code"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.1.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/anthropics/claude-code/security/advisories/GHSA-4q92-rfm6-2cqx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-25724"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/anthropics/claude-code"
  }, {
    "type" : "WEB",
    "url" : "https://www.terra.security/blog/when-ai-becomes-the-attack-surface-lessons-from-discovering-cve-2026-25724"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285", "CWE-61" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-06T19:08:04Z",
    "nvd_published_at" : "2026-02-06T18:16:00Z"
  }
}