CVE-2020-7702: Templ8 Prototype Pollution Vulnerability

CRITICAL
Advisory Identifier: GHSA-c7m7-4257-h698
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CVSS 9.8
CWE-1321 CWE-915
Published
Advisory Summary

CVE-2020-7702 is a CRITICAL (CVSS 9.8) prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Templ8 libraries in the npm ecosystem. The issue involves prototype pollution in templ8. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7702 at a Glance

CVE Identifier CVE-2020-7702
GHSA Identifier GHSA-c7m7-4257-h698
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Templ8
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-7702

To remediate this vulnerability, upgrade all affected Templ8 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

templ8 fixed: Latest secure release 
npm install templ8@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 templ8

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7702, inspect your project dependencies using npm:

npm ls templ8

Analyze the terminal output to locate any version of Templ8 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls templ8 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-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. In Templ8, 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

All versions of package templ8 up to and including 0.0.44 are vulnerable to Prototype Pollution via the parse function.

CVE-2020-7702 Affected Templ8 Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
templ8
npm/templ8
npm
≤ 0.0.44

References

NVD — CVE-2020-7702 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7702
snyk.io/vuln/snyk-js-templ8... WEB
https://snyk.io/vuln/SNYK-JS-TEMPL8-598770

Frequently Asked Questions

What is CVE-2020-7702?
CVE-2020-7702 is a security vulnerability in Templ8 involving Prototype Pollution in templ8 under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Templ8 versions are affected?
Affected versions include releases prior to current release patches across affected packages: templ8.
What version fixes CVE-2020-7702?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is templ8 affected?
Yes, templ8 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-2020-7702?
CVE-2020-7702 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-7702?
CVE-2020-7702 is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.).
How can I check npm dependencies for CVE-2020-7702?
Run the dependency tree command: 'npm ls templ8'. 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-c7m7-4257-h698",
  "modified" : "2021-05-05T21:29:36Z",
  "published" : "2021-05-06T17:29:13Z",
  "aliases" : [ "CVE-2020-7702" ],
  "summary" : "Prototype Pollution in templ8",
  "details" : "All versions of package templ8 up to and including 0.0.44 are vulnerable to Prototype Pollution via the parse function.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "templ8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.0.44"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7702"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-TEMPL8-598770"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321", "CWE-915" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-05T21:29:36Z",
    "nvd_published_at" : "2020-08-17T14:15:00Z"
  }
}