---
cve: "CVE-2023-23556"
severity: "CRITICAL"
cvss: 9.8
epss: "89%"
vendor: "Facebook"
kev: false
exploited: false
published: "2023-05-18 22:15:09"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-09T13:31:00+02:00"
---

# CVE-2023-23556

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

An error in BigInt conversion to Number in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f80 could have been used by a malicious attacker to execute arbitrary code due to an out-of-bound write. Note that this bug is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- a6dcafe6ded8e61658b40f5699878cd19a481f80 (Commit)

## Referenzen

- <https://www.facebook.com/security/advisories/cve-2023-23556>
- <https://github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-23556) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_