CVE-2025-59829: @anthropic ai/claude code Claude Code Permission Deny Bypass Vulnerability

LOW
Advisory Identifier: GHSA-66m2-gx93-v996
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CWE-61
Published
Advisory Summary

CVE-2025-59829 is a LOW claude code permission deny bypass vulnerability (CWE-61: UNIX Symbolic Link (Symlink) Following) affecting @anthropic ai/claude code libraries in the npm ecosystem. The issue involves claude code permission deny bypass through symlink. Remediation is available by upgrading affected packages to version 1.0.120.

CVE-2025-59829 at a Glance

CVE Identifier CVE-2025-59829
GHSA Identifier GHSA-66m2-gx93-v996
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-61: UNIX Symbolic Link (Symlink) Following
Affected Product @anthropic ai/claude code
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2025-59829

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: 1.0.120 
npm install @anthropic-ai/claude-code@1.0.120
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-2025-59829, 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 1.0.120), 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-61: UNIX Symbolic Link (Symlink) Following, where the product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. this could allow an attacker to cause the product to operate on unauthorized files. 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 account for symlinks when checking permission deny rules. If a user explicitly denied Claude Code access to a file and Claude Code had access to a symlink pointing to that file, it was possible for Claude Code to access the file. Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version. Thank you to https://hackerone.com/vinai for reporting this issue!

CVE-2025-59829 Affected @anthropic ai/claude code Versions

1 component(s)
Fixed Versions:
1.0.120
Product / Package Ecosystem Affected Versions Fixed Version
@anthropic-ai/claude-code
npm/@anthropic-ai/claude-code
npm
< 1.0.120
1.0.120

References

GitHub Advisory / Wiki ADVISORY
https://github.com/anthropics/claude-code/security/advisories/GHSA-66m2-gx93-v996
NVD — CVE-2025-59829 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59829
@anthropic ai/claude code Source Repository REPOSITORY
https://github.com/anthropics/claude-code

Frequently Asked Questions

What is CVE-2025-59829?
CVE-2025-59829 is a security vulnerability in @anthropic ai/claude code involving Claude Code permission deny bypass through symlink under CWE-61: UNIX Symbolic Link (Symlink) Following.
Which @anthropic ai/claude code versions are affected?
Affected versions include releases prior to 1.0.120 across affected packages: @anthropic-ai/claude-code.
What version fixes CVE-2025-59829?
Upgrading to 1.0.120 (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 1.0.120. Upgrade your dependency to 1.0.120 or later.
What CWE is associated with CVE-2025-59829?
CVE-2025-59829 is classified under CWE-61: UNIX Symbolic Link (Symlink) Following (The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.).
How can I check npm dependencies for CVE-2025-59829?
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-66m2-gx93-v996",
  "modified" : "2025-10-13T15:10:14Z",
  "published" : "2025-10-03T14:17:58Z",
  "aliases" : [ "CVE-2025-59829" ],
  "summary" : "Claude Code permission deny bypass through symlink",
  "details" : "Claude Code failed to account for symlinks when checking permission deny rules. If a user explicitly denied Claude Code access to a file and Claude Code had access to a symlink pointing to that file, it was possible for Claude Code to access the file. \n\nUsers on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version.\n\nThank you to https://hackerone.com/vinai 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:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@anthropic-ai/claude-code"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.120"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/anthropics/claude-code/security/advisories/GHSA-66m2-gx93-v996"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-59829"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/anthropics/claude-code"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-61" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-10-03T14:17:58Z",
    "nvd_published_at" : "2025-10-03T20:15:33Z"
  }
}