High-severity macOS kernel memory corruption (CWE-119) with CVSS 9.8 affecting widely used Apple desktops/laptops; patchable but requires org-wide rollout.
CVE-2026-28911
macOS memory corruption allows malicious app to corrupt system process (Sonoma/Tahoe).
Is CVE-2026-28911 being exploited?
Not confirmed. CVE-2026-28911 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-28911?
CVE-2026-28911 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-28911?
Yes. A fix has been recorded for CVE-2026-28911. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28911 affect?
CVE-2026-28911 affects macOS Sonoma (pre-14.8.8), macOS Tahoe (pre-26.6). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28911?
Apply Sonoma 14.8.8 / Tahoe 26.6 updates immediately; restrict untrusted app installs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local malicious app can corrupt system process memory, enabling privilege escalation, arbitrary code execution, or system instability.
Immediate action required
- affected< 14.8.8
- affected< 26.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.