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TI-2020-01840 Aliases CVE-2020-1913GHSA-gmpm-xp43-f7g6

Incorrect numeric conversion in Meta Hermes

Priority LOW 38CWE-195Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
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

An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE 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 0.01202 68th percentileScored 2026-11-07
Fix Fixed hermes-engine (npm): 0.5.2

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
MetaHermescommit prior to 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6—No fix listedCNA
—hermes-engine (npm)before 0.5.20.5.2Patch availableGHSA-gmpm-xp43-f7g6
  • Hermes VendorMeta Affected commit prior to 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 Fixed in — No fix listed CNA
  • hermes-engine (npm) Vendor— Affected before 0.5.2 Fixed in 0.5.2 Patch available GHSA-gmpm-xp43-f7g6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:facebook:hermes:*:*:*:*:*:*:*:*up to 0.4.3VulnerableMeta
  • cpe:2.3:a:facebook:hermes:*:*:*:*:*:*:*:* Versions up to 0.4.3 Vulnerable ·Meta

Remediation

  • Fix · GHSA-gmpm-xp43-f7g6 hermes-engine (npm) Fixed in 0.5.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-1913
  2. 2026-10-03 Alias added: GHSA-gmpm-xp43-f7g6

References

Patch 1

Advisory 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