CVE-2021-23346: Html parse stringify Denial of Service Vulnerability

Q: What is CVE-2021-23346?

CVE-2021-23346 is a security vulnerability in Html parse stringify involving html-parse-stringify and html-parse-stringify2 vulnerable to Regular expression denial of service (ReDoS) under CWE-400: Uncontrolled Resource Consumption.

Q: Which Html parse stringify versions are affected?

Affected versions include releases prior to 2.0.1 across affected packages: html-parse-stringify, html-parse-stringify2.

Q: What version fixes CVE-2021-23346?

Upgrading to 2.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is html-parse-stringify affected?

Yes, html-parse-stringify is affected in releases prior to 2.0.1. Upgrade your dependency to 2.0.1 or later.

Q: Is html-parse-stringify2 affected?

Yes, html-parse-stringify2 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

Q: What is the CVSS score of CVE-2021-23346?

CVE-2021-23346 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:N/I:N/A:L.

Q: What CWE is associated with CVE-2021-23346?

CVE-2021-23346 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).

Q: How can I check npm dependencies for CVE-2021-23346?

Run the dependency tree command: 'npm ls html-parse-stringify'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

MODERATE

Advisory Identifier: GHSA-545q-3fg6-48m7

CVSS 5.3

CWE-400

Published 2021-03-18

Advisory Summary

CVE-2021-23346 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Html parse stringify libraries in the npm ecosystem. The issue involves html-parse-stringify and html-parse-stringify2 vulnerable to regular expression denial of service (redos). Remediation is available by upgrading affected packages to version 2.0.1.

CVE-2021-23346 at a Glance

CVE Identifier CVE-2021-23346

GHSA Identifier GHSA-545q-3fg6-48m7

Severity MODERATE

CVSS v3.1 Base Score 5.3

CWE Classification CWE-400: Uncontrolled Resource Consumption

Affected Product Html parse stringify

Package Ecosystem npm

Published Date 2021-03-18

Last Updated 2023-09-12

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:N/I:N/A:L).

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 Low (A:L)

How to Fix CVE-2021-23346

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

html-parse-stringify fixed: 2.0.1

npm install html-parse-stringify@2.0.1

html-parse-stringify2 fixed: Latest secure release

npm install html-parse-stringify2@Latest secure release

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 html-parse-stringify

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-23346, inspect your project dependencies using npm:

npm ls html-parse-stringify

Analyze the terminal output to locate any version of Html parse stringify in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.1), your application is affected.

Note: The npm ls html-parse-stringify 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 Html parse stringify, 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

This affects the package html-parse-stringify before 2.0.1; all versions of package html-parse-stringify2. Sending certain input could cause one of the regular expressions that is used for parsing to backtrack, freezing the process.

CVE-2021-23346 Affected Html parse stringify Versions

2 component(s)

Fixed Versions:

2.0.1

Product / Package	Ecosystem	Affected Versions	Fixed Version
html-parse-stringify npm/html-parse-stringify	npm	< 2.0.1	2.0.1
html-parse-stringify2 npm/html-parse-stringify2	npm	≤ 2.0.1

References

NVD — CVE-2021-23346 NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-23346

Security Fix Commit FIX COMMIT

https://github.com/HenrikJoreteg/html-parse-stringify/commit/c7274a48e59c92b2b7e906fedf9065159e73fe12

Html parse stringify Source Repository REPOSITORY

https://github.com/HenrikJoreteg/html-parse-stringify/blob/master/lib/parse.js%23L2

Html parse stringify Release RELEASE

https://github.com/HenrikJoreteg/html-parse-stringify/releases/tag/v2.0.1

Html parse stringify Source Repository REPOSITORY

https://github.com/rayd/html-parse-stringify2/blob/master/lib/parse.js%23L2

snyk.io/vuln/snyk-java-orgw... WEB

https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1080633

snyk.io/vuln/snyk-js-htmlpa... WEB

https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY-1079306

snyk.io/vuln/snyk-js-htmlpa... WEB

https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY2-1079307

Frequently Asked Questions

What is CVE-2021-23346?

CVE-2021-23346 is a security vulnerability in Html parse stringify involving html-parse-stringify and html-parse-stringify2 vulnerable to Regular expression denial of service (ReDoS) under CWE-400: Uncontrolled Resource Consumption.

Which Html parse stringify versions are affected?

Affected versions include releases prior to 2.0.1 across affected packages: html-parse-stringify, html-parse-stringify2.

What version fixes CVE-2021-23346?

Upgrading to 2.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.

Is html-parse-stringify affected?

Yes, html-parse-stringify is affected in releases prior to 2.0.1. Upgrade your dependency to 2.0.1 or later.

Is html-parse-stringify2 affected?

Yes, html-parse-stringify2 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2021-23346?

CVE-2021-23346 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:N/I:N/A:L.

What CWE is associated with CVE-2021-23346?

CVE-2021-23346 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-2021-23346?

Run the dependency tree command: 'npm ls html-parse-stringify'. 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-545q-3fg6-48m7",
  "modified" : "2023-09-12T20:51:14Z",
  "published" : "2021-03-18T19:39:31Z",
  "aliases" : [ "CVE-2021-23346" ],
  "summary" : "html-parse-stringify and html-parse-stringify2 vulnerable to Regular expression denial of service (ReDoS)",
  "details" : "This affects the package html-parse-stringify before 2.0.1; all versions of package html-parse-stringify2. Sending certain input could cause one of the regular expressions that is used for parsing to backtrack, freezing the process.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "html-parse-stringify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "html-parse-stringify2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23346"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HenrikJoreteg/html-parse-stringify/commit/c7274a48e59c92b2b7e906fedf9065159e73fe12"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HenrikJoreteg/html-parse-stringify/blob/master/lib/parse.js%23L2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HenrikJoreteg/html-parse-stringify/releases/tag/v2.0.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rayd/html-parse-stringify2/blob/master/lib/parse.js%23L2"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1080633"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY-1079306"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY2-1079307"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-12T23:03:51Z",
    "nvd_published_at" : "2021-03-04T17:15:00Z"
  }
}

CVSS V3

5.3 MODERATE