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TI-2023-11181 Aliases CVE-2023-25933GHSA-jgwv-fx37-24vq

Type confusion in Meta Hermes

Priority MEDIUM 51CWE-843Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-843 and the CVSS impact.

Summary

A type confusion bug in TypedArray prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81 could have been used by a malicious attacker to execute arbitrary code via untrusted JavaScript. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00891 59th percentileScored 2026-11-07
Fix Fixed Hermes (Facebook): e6ed9c1a4b02dc219de1648f44cd808a56171b81

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MetaHermesbefore e6ed9c1a4b02dc219de1648f44cd808a56171b81e6ed9c1a4b02dc219de1648f44cd808a56171b81Patch availableCNA
  • Hermes VendorMeta Affected before e6ed9c1a4b02dc219de1648f44cd808a56171b81 Fixed in e6ed9c1a4b02dc219de1648f44cd808a56171b81 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:facebook:hermes:-:*:*:*:*:*:*:*not specified by NVDVulnerableMeta
  • cpe:2.3:a:facebook:hermes:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Meta

Remediation

  • Fix · CNA Hermes (Facebook) Fixed in e6ed9c1a4b02dc219de1648f44cd808a56171b81

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Facebook Hermes e6ed9c1a4b02dc219de1648f44cd808a56171b81

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-25933
  2. 2026-10-03 Alias added: GHSA-jgwv-fx37-24vq

References

Patch 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-2023-09388 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
  • 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