CVE-2019-8526: in the CISA KEV catalogue
Apple macOS Use-After-Free Vulnerability. CISA added CVE-2019-8526 to the Known Exploited Vulnerabilities catalogue on 2023-04-17 with a default due date of 2023-05-08. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Apple macOS contains a use-after-free vulnerability that could allow for privilege escalation. (CISA description)
- Vendor / product
- Apple macOS
- CWE
- CWE-416
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 0.70%, percentile 53 (scored 2026-11-03)
EPSS puts about 7.0 in 1,000 odds (0.70%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 53% of scored CVEs. Most CVEs score under 1%, so a high percentile can sit on a small probability: read the percentage first.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2019-8526 in the CISA KEV catalogue?
Yes. CISA added CVE-2019-8526 (Apple macOS Use-After-Free Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-04-17. CISA's default due date for it is 2023-05-08.
Is CVE-2019-8526 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2019-8526. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2019-8526?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2019-8526