Out-of-bounds Read in Apple macOS
CVE-2026-20620
An out-of-bounds read issue was addressed with improved input validation. This issue is fixed in macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, macOS Tahoe 26.3. An attacker may be able to cause unexpected system termination or read kernel memory.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Apple macOS — versions 0
Weakness classification (CWE)
References
- support.apple.com/en-us/126348 (Release Notes, Vendor Advisory)
- support.apple.com/en-us/126349 (Release Notes, Vendor Advisory)
- support.apple.com/en-us/126350 (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20620?
- CVE-2026-20620 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 7.7/10. Published 2026-02-11.
- How severe is CVE-2026-20620?
- High severity. CVSS v3 base score is 7.7 out of 10.