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TI-2020-01842 Aliases CVE-2020-1915GHSA-x4cf-6jr3-3qvp

Out-of-bounds read in Meta Hermes

Priority LOW 36CWE-125Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-125 and the CVSS impact.

Summary

An out-of-bounds read in the JavaScript Interpreter in Facebook Hermes prior to commit 8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0 allows attackers to cause a denial of service attack or possible further memory corruption 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 0.01603 75th 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 8cb935c—No fix listedCNA
—hermes-engine (npm)before 0.7.20.7.2Patch availableGHSA-x4cf-6jr3-3qvp
  • Hermes VendorMeta Affected commit prior to 8cb935c Fixed in — No fix listed CNA
  • hermes-engine (npm) Vendor— Affected before 0.7.2 Fixed in 0.7.2 Patch available GHSA-x4cf-6jr3-3qvp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:facebook:hermes:*:*:*:*:*:*:*:*before 2020-09-25VulnerableMeta
  • cpe:2.3:a:facebook:hermes:*:*:*:*:*:*:*:* Versions before 2020-09-25 Vulnerable ·Meta

Remediation

  • Fix · GHSA-x4cf-6jr3-3qvp hermes-engine (npm) Fixed in 0.7.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-1915
  2. 2026-10-03 Alias added: GHSA-x4cf-6jr3-3qvp

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-2020-01841 A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook 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