Read the docs
TI-2020-01841 Aliases CVE-2020-1914GHSA-327c-qx3v-h673

A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes…

Priority MEDIUM 47CWE-670Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

EPSS 0.02515 84th percentileScored 2026-11-07
Fix Fixed hermes-engine (npm): 0.7.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MetaHermescommit prior to b2021df—No fix listedCNA
—hermes-engine (npm)before 0.7.20.7.2Patch availableGHSA-327c-qx3v-h673
  • Hermes VendorMeta Affected commit prior to b2021df Fixed in — No fix listed CNA
  • hermes-engine (npm) Vendor— Affected before 0.7.2 Fixed in 0.7.2 Patch available GHSA-327c-qx3v-h673

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:facebook:hermes:*:*:*:*:*:*:*:*before 2020-10-01VulnerableMeta
  • cpe:2.3:a:facebook:hermes:*:*:*:*:*:*:*:* Versions before 2020-10-01 Vulnerable ·Meta

Remediation

  • Fix · GHSA-327c-qx3v-h673 hermes-engine (npm) Fixed in 0.7.2 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-1914
  2. 2026-10-03 Alias added: GHSA-327c-qx3v-h673

References

Patch 1

Advisory 2

Other 2

  • TI-2023-14306 Use after free in Meta Hermes CVSS 3.1CRITICAL 9.8
  • TI-2023-12661 Use after free in Meta Hermes CVSS 3.1CRITICAL 9.8
  • TI-2023-11181 Type confusion in Meta Hermes CVSS 3.1CRITICAL 9.8
  • TI-2023-09388 Type confusion in Meta Hermes CVSS 3.1CRITICAL 9.8
  • TI-2023-09387 Out-of-bounds write in Meta Hermes CVSS 3.1CRITICAL 9.8
  • TI-2020-01823 Stack-based buffer overflow in Meta Hermes CVSS 3.1CRITICAL 9.8
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences