CVE-2023-40436: Apple macOS · An attacker may be able to cause unexpected system termination or read kernel memory
Affects Apple macOSSource CVE Database V5
Not known to be exploited.
Data as of 25 Oct 2026, 21:58 UTC
Rated High by the CNA (apple) · No CVSS score from NVD or the CNA
- EPSS
- 1.2% chance of exploitation in 30 days – higher than 70% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 26 Sep 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.
What to do
AI-suggested
A fix is available in macOS Sonoma 14. Users and administrators should update to this version to remediate the vulnerability.
Description
CVE-2023-40436 is a vulnerability in Apple macOS that could allow an attacker to cause unexpected system termination or read kernel memory. The issue was addressed by Apple with improved bounds checks and is fixed in macOS Sonoma 14.