CVE-2026-24052: @anthropic ai/claude code Claude Code Has A Domain Vulnerability

HIGH
Advisory Identifier: GHSA-vhw5-3g5m-8ggf
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CWE-601
Published
Advisory Summary

CVE-2026-24052 is a HIGH claude code has a domain vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting @anthropic ai/claude code libraries in the npm ecosystem. The issue involves claude code has a domain validation bypass which allows automatic requests to attacker-controlled domains. Remediation is available by upgrading affected packages to version 1.0.111.

CVE-2026-24052 at a Glance

CVE Identifier CVE-2026-24052
GHSA Identifier GHSA-vhw5-3g5m-8ggf
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product @anthropic ai/claude code
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-24052

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: 1.0.111 
npm install @anthropic-ai/claude-code@1.0.111
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-2026-24052, 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 1.0.111), 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. 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 contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a `startsWith()` function to validate trusted domains (e.g., `docs.python.org`, `modelcontextprotocol.io`), this could have enabled attackers to register domains like `modelcontextprotocol.io.example.com` that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version. Thank you to hackerone.com/47sid-praetorian for reporting this issue!

CVE-2026-24052 Affected @anthropic ai/claude code Versions

1 component(s)
Fixed Versions:
1.0.111
Product / Package Ecosystem Affected Versions Fixed Version
@anthropic-ai/claude-code
npm/@anthropic-ai/claude-code
npm
< 1.0.111
1.0.111

References

GitHub Advisory / Wiki ADVISORY
https://github.com/anthropics/claude-code/security/advisories/GHSA-vhw5-3g5m-8ggf
NVD — CVE-2026-24052 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-24052
@anthropic ai/claude code Source Repository REPOSITORY
https://github.com/anthropics/claude-code

Frequently Asked Questions

What is CVE-2026-24052?
CVE-2026-24052 is a security vulnerability in @anthropic ai/claude code involving Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which @anthropic ai/claude code versions are affected?
Affected versions include releases prior to 1.0.111 across affected packages: @anthropic-ai/claude-code.
What version fixes CVE-2026-24052?
Upgrading to 1.0.111 (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 1.0.111. Upgrade your dependency to 1.0.111 or later.
What CWE is associated with CVE-2026-24052?
CVE-2026-24052 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check npm dependencies for CVE-2026-24052?
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-vhw5-3g5m-8ggf",
  "modified" : "2026-02-03T22:15:32Z",
  "published" : "2026-02-03T19:15:59Z",
  "aliases" : [ "CVE-2026-24052" ],
  "summary" : "Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains",
  "details" : "Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a `startsWith()` function to validate trusted domains (e.g., `docs.python.org`, `modelcontextprotocol.io`), this could have enabled attackers to register domains like `modelcontextprotocol.io.example.com` that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. \n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nThank you to hackerone.com/47sid-praetorian for reporting this issue!",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@anthropic-ai/claude-code"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.111"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/anthropics/claude-code/security/advisories/GHSA-vhw5-3g5m-8ggf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-24052"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/anthropics/claude-code"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-03T19:15:59Z",
    "nvd_published_at" : "2026-02-03T21:16:13Z"
  }
}