Vulnerability · Published May 18, 2023 · Assigned by facebook
CVE-2023-23556
Critical 9.8
In plain English
A critical-severity security flaw in Hermes from Facebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.9%top 40.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
References
- https://www.facebook.com/security/advisories/cve-2023-23556 x_refsource_CONFIRM
- https://github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80 x_refsource_MISC