Vulnerabilities in pkg:npm/hermes-engine

PACKAGE
Advisory Identifier: GHSA-327c-qx3v-h673
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Advisory Summary

CVE-2020-1914 is a CRITICAL (CVSS 9.8) always-incorrect control flow implementation vulnerability (CWE-1119: Excessive Use of Unconditional Branching) affecting Hermes engine libraries in the npm ecosystem. The issue involves always-incorrect control flow implementation in facebook hermes. Remediation is available by upgrading affected packages to version 0.7.2.

7 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/hermes-engine

7 Known Advisory Record(s)

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

Advisory ID CVE / NVD Severity Summary
GHSA-327c-qx3v-h673 CVE-2020-1914 CRITICAL Always-Incorrect Control Flow Implementation in Facebook Hermes
GHSA-x4cf-6jr3-3qvp CVE-2020-1915 HIGH Out-of-bounds Read in Facebook Hermes
GHSA-f5x2-xv93-4p23 CVE-2020-1911 CRITICAL Access of Resource Using Incompatible Type in Facebook Hermes
GHSA-pf27-929j-9pmm CVE-2020-1912 HIGH Out-of-bounds Read and Out-of-bounds Write in Facebook Hermes
GHSA-gmpm-xp43-f7g6 CVE-2020-1913 HIGH Signed to Unsigned Conversion Error in Facebook Hermes
GHSA-mph8-6787-r8hw CVE-2021-24037 CRITICAL Use After Free in Hermes
GHSA-7mhc-prgv-r3q4 CVE-2021-24044 CRITICAL Access of Resource Using Incompatible Type in Hermes

CVE-2020-1914 at a Glance

CVE Identifier CVE-2020-1914
GHSA Identifier GHSA-327c-qx3v-h673
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1119: Excessive Use of Unconditional Branching
Affected Product Hermes engine
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-2020-1914

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

hermes-engine fixed: 0.7.2 
npm install hermes-engine@0.7.2
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 hermes-engine

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-1914, inspect your project dependencies using npm:

npm ls hermes-engine

Analyze the terminal output to locate any version of Hermes engine in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.7.2), your application is affected.

Note: The npm ls hermes-engine 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-1119: Excessive Use of Unconditional Branching, where the code uses too many unconditional branches (such as "goto"). In Hermes engine, 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

A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes prior to commit b2021df620824627f5a8c96615edbd1eb7fdddfc allows attackers to potentially read out of bounds or theoretically execute arbitrary code via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.

CVE-2020-1914 Affected Hermes engine Versions

1 component(s)
Fixed Versions:
0.7.2
Product / Package Ecosystem Affected Versions Fixed Version
hermes-engine
npm/hermes-engine
npm
< 0.7.2
0.7.2

References

NVD — CVE-2020-1914 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-1914
Hermes engine Source Repository REPOSITORY
https://github.com/facebook/hermes/issues/373
Security Fix Commit FIX COMMIT
https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc
Hermes engine Source Repository REPOSITORY
https://github.com/facebook/hermes
Hermes engine Security Information SECURITY
https://www.facebook.com/security/advisories/cve-2020-1914

Frequently Asked Questions

What is CVE-2020-1914?
CVE-2020-1914 is a security vulnerability in Hermes engine involving Always-Incorrect Control Flow Implementation in Facebook Hermes under CWE-1119: Excessive Use of Unconditional Branching.
Which Hermes engine versions are affected?
Affected versions include releases prior to 0.7.2 across affected packages: hermes-engine.
What version fixes CVE-2020-1914?
Upgrading to 0.7.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is hermes-engine affected?
Yes, hermes-engine is affected in releases prior to 0.7.2. Upgrade your dependency to 0.7.2 or later.
What is the CVSS score of CVE-2020-1914?
CVE-2020-1914 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-2020-1914?
CVE-2020-1914 is classified under CWE-1119: Excessive Use of Unconditional Branching (The code uses too many unconditional branches (such as "goto").).
How can I check npm dependencies for CVE-2020-1914?
Run the dependency tree command: 'npm ls hermes-engine'. 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-327c-qx3v-h673",
  "modified" : "2022-06-27T17:05:26Z",
  "published" : "2022-05-24T17:30:18Z",
  "aliases" : [ "CVE-2020-1914" ],
  "summary" : "Always-Incorrect Control Flow Implementation in Facebook Hermes",
  "details" : "A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes prior to commit b2021df620824627f5a8c96615edbd1eb7fdddfc allows attackers to potentially read out of bounds or theoretically execute arbitrary code via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.",
  "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" : "hermes-engine"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.7.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.7.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-1914"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/facebook/hermes/issues/373"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/facebook/hermes"
  }, {
    "type" : "WEB",
    "url" : "https://www.facebook.com/security/advisories/cve-2020-1914"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1119", "CWE-670" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-24T01:23:21Z",
    "nvd_published_at" : "2020-10-08T19:15:00Z"
  }
}