What is CVE-2026-39871?

CVE-2026-39871 is a high-severity vulnerability in Apple macOS, classified under Files or Directories Accessible to External Parties. CVSS score: 7.5/10. Published 2026-05-11.

How severe is CVE-2026-39871?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apple macOS

CVE-2026-39871

A path handling issue was addressed with improved logic. This issue is fixed in macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. An app may be able to observe unprotected user data.

Published 2026-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Apple macOS — versions 0

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

support.apple.com/en-us/127115 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127116 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127117 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-39871?: CVE-2026-39871 is a high-severity vulnerability in Apple macOS, classified under Files or Directories Accessible to External Parties. CVSS score: 7.5/10. Published 2026-05-11.
How severe is CVE-2026-39871?: High severity. CVSS v3 base score is 7.5 out of 10.