Vulnerabilities in pkg:npm/is-email

PACKAGE
Advisory Identifier: GHSA-j377-2x76-558h
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Advisory Summary

CVE-2021-36716 is a HIGH (CVSS 7.5) improper input validation vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Is email libraries in the npm ecosystem. The issue involves improper input validation in is-email. Remediation is available by upgrading affected packages to version 1.0.1.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/is-email

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/is-email. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-j377-2x76-558h CVE-2021-36716 HIGH Improper Input Validation in is-email

CVE-2021-36716 at a Glance

CVE Identifier CVE-2021-36716
GHSA Identifier GHSA-j377-2x76-558h
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Is email
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:3.1/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-2021-36716

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

is-email fixed: 1.0.1 
npm install is-email@1.0.1
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 is-email

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-36716, inspect your project dependencies using npm:

npm ls is-email

Analyze the terminal output to locate any version of Is email in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.1), your application is affected.

Note: The npm ls is-email 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Is email, 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

is-email helps validate an email address. A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.

CVE-2021-36716 Affected Is email Versions

1 component(s)
Fixed Versions:
1.0.1
Product / Package Ecosystem Affected Versions Fixed Version
is-email
npm/is-email
npm
< 1.0.1
1.0.1

References

NVD — CVE-2021-36716 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-36716
Is email Source Repository REPOSITORY
https://github.com/segmentio/is-email
Is email Source Repository REPOSITORY
https://github.com/segmentio/is-email/releases
segment.com/docs/release_notes/... WEB
https://segment.com/docs/release_notes/2021-07-13-cve-2021-36716

Frequently Asked Questions

What is CVE-2021-36716?
CVE-2021-36716 is a security vulnerability in Is email involving Improper Input Validation in is-email under CWE-400: Uncontrolled Resource Consumption.
Which Is email versions are affected?
Affected versions include releases prior to 1.0.1 across affected packages: is-email.
What version fixes CVE-2021-36716?
Upgrading to 1.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is is-email affected?
Yes, is-email is affected in releases prior to 1.0.1. Upgrade your dependency to 1.0.1 or later.
What is the CVSS score of CVE-2021-36716?
CVE-2021-36716 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-36716?
CVE-2021-36716 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2021-36716?
Run the dependency tree command: 'npm ls is-email'. 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-j377-2x76-558h",
  "modified" : "2022-05-04T03:12:57Z",
  "published" : "2021-12-10T17:25:21Z",
  "aliases" : [ "CVE-2021-36716" ],
  "summary" : "Improper Input Validation in is-email",
  "details" : "is-email helps validate an email address. A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "is-email"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-36716"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/segmentio/is-email"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/segmentio/is-email/releases"
  }, {
    "type" : "WEB",
    "url" : "https://segment.com/docs/release_notes/2021-07-13-cve-2021-36716"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-07-15T18:43:45Z",
    "nvd_published_at" : "2021-07-14T16:15:00Z"
  }
}