CVE-2021-3804: @tarojs/helper Inefficient Regular Expression Complexity Vulnerability

HIGH
Advisory Identifier: GHSA-468q-v4jj-485h
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CVSS 7.5
CWE-1333
Published
Advisory Summary

CVE-2021-3804 is a HIGH (CVSS 7.5) inefficient regular expression complexity vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting @tarojs/helper libraries in the npm ecosystem. The issue involves inefficient regular expression complexity in taro. Remediation is available by upgrading affected packages to version 3.3.9.

CVE-2021-3804 at a Glance

CVE Identifier CVE-2021-3804
GHSA Identifier GHSA-468q-v4jj-485h
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product @tarojs/helper
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2021-3804

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

@tarojs/helper fixed: 3.3.9 
npm install @tarojs/helper@3.3.9
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 @tarojs/helper

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-3804, inspect your project dependencies using npm:

npm ls @tarojs/helper

Analyze the terminal output to locate any version of @tarojs/helper in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.9), your application is affected.

Note: The npm ls @tarojs/helper 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-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In @tarojs/helper, 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

taro is vulnerable to Inefficient Regular Expression Complexity

CVE-2021-3804 Affected @tarojs/helper Versions

1 component(s)
Fixed Versions:
3.3.9
Product / Package Ecosystem Affected Versions Fixed Version
@tarojs/helper
npm/@tarojs/helper
npm
< 3.3.9
3.3.9

References

NVD — CVE-2021-3804 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3804
Security Fix Commit FIX COMMIT
https://github.com/nervjs/taro/commit/acadb6c826ba57f2030a626f1de4f7b4608fcdb5
@tarojs/helper Source Repository REPOSITORY
https://github.com/nervjs/taro
huntr.dev/bounties/0ebe85e6-c... WEB
https://huntr.dev/bounties/0ebe85e6-cc85-42b8-957e-18d8df277414

Frequently Asked Questions

What is CVE-2021-3804?
CVE-2021-3804 is a security vulnerability in @tarojs/helper involving Inefficient Regular Expression Complexity in taro under CWE-1333: Inefficient Regular Expression Complexity.
Which @tarojs/helper versions are affected?
Affected versions include releases prior to 3.3.9 across affected packages: @tarojs/helper.
What version fixes CVE-2021-3804?
Upgrading to 3.3.9 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @tarojs/helper affected?
Yes, @tarojs/helper is affected in releases prior to 3.3.9. Upgrade your dependency to 3.3.9 or later.
What is the CVSS score of CVE-2021-3804?
CVE-2021-3804 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-3804?
CVE-2021-3804 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check npm dependencies for CVE-2021-3804?
Run the dependency tree command: 'npm ls @tarojs/helper'. 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-468q-v4jj-485h",
  "modified" : "2021-09-20T20:00:02Z",
  "published" : "2021-09-20T20:09:59Z",
  "aliases" : [ "CVE-2021-3804" ],
  "summary" : "Inefficient Regular Expression Complexity in taro",
  "details" : "taro is vulnerable to Inefficient Regular Expression Complexity",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@tarojs/helper"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3804"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nervjs/taro/commit/acadb6c826ba57f2030a626f1de4f7b4608fcdb5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/nervjs/taro"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/0ebe85e6-cc85-42b8-957e-18d8df277414"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-20T20:00:02Z",
    "nvd_published_at" : "2021-09-17T07:15:00Z"
  }
}